GHCN – Mexico, A Megathermal Vacation Band

GHCN -Mexican GROUP A: Tropical/megathermal climates

GHCN -Mexican GROUP A: Tropical/megathermal climates

Orginal image.

Contrary to what you might expect, the red bits mean dry, not hot, and the blue bits are not cold.

The “Blue Bits” are in the Tropical / Megathermal band, as classified via the Koppen Climate Classification system, described here.

And so are the bulk of the New Thermometers In Old Mexico…

With each one of these continent or country focused investigations I learn a new trick. For New Zealand, it was “delete the one really cold island and hide it in some gratuitous changes”. For California it was “move all the thermometers from the mountains to the beach”. For Australia it was the march of the thermometers north.

Here, for Mexico, I learned that there is more to migration than latitude. A large bolus of thermometers were added, but the latitudes were very similar; and frankly, a lot of Mexico is hot. To make most sense of it took a map of climate zones. When looked at in the context of that map, we can see that a lot of the thermometers are added in the hot, tropical, “megathermal” band. Yes, there is a bit of fluff elsewhere to act as a bit of cover, but the bulk of the action is a broad addition of thermometers in the tropical hot part of Mexico.

Once again, we have thermometers with an allergy to snow and that seem to have altitude sickness. Only one heads to the hills, while a dozen run away…

Anyone for a Hot Vacation in Old Mexico? The places where new thermometer were placed would make a decent itinerary for a tour of the warmest parts. Many are a ways from the beach, though. Wouldn’t want any “ocean moderation” if we can avoid it. But they are on the beach on the Gulf of Mexico side. If you’ve ever been there, you know that “moderation” is not one of it’s features… ( 99 F and 99 % humidity one horrid day on the Gulf Coast comes to mind… moisture condensed on me because I was cooler than the dew point as I stepped outside).

The details will be down below. Here’s the list of stations with my description of where they end up. There is one mountain station added, and a token deletion of Guadelajara (with a reciprical replacement just a bit more south for a slight warming impact…). But there is nothing on the Baja nor much in the sometimes snowy mountains to offset this “stack of the deck” with “megathermal” heat.

Here is the list of the changes from 1996 to 2009 with my description of where they are from looking at the Google Earth maps. A leading + is an add, the one deletion is Guadalajara.

$ cat Mexico.stuff 
[chiefio@tubularbells analysis]$ diff Temps/414.stns1996 Temps/414.stns2009
+ 41476160000 HERMOSILLO,SO                   29.07 -110.95  211  225U  233HIxxno-9x-9WARM GRASS/SHRUBC3  77
+ 41476220000 TEMOSACHIC,CH                   28.95 -107.83 1870 1944R   -9MVxxno-9x-9WARM DECIDUOUS  B2   0
+ 41476243000 PIEDRAS NEGRA                   28.70 -100.52  250  227S   21FLxxno-9A 1WARM GRASS/SHRUBC3  44
+ 41476311000 CHOIX,SIN.                      26.72 -108.28  238  403R   -9HIxxno-9x-9TROP. SAVANNA   A2   0
+ 41476373000 TEPEHUANES,DG                   25.35 -105.75 1810 2061R   -9MVxxno-9x-9WARM DECIDUOUS  B2   0
+ 41476525000 ZACATECAS,ZAC                   22.78 -102.57 2612 2421U   50HIxxno-9x-9WARM DECIDUOUS  C   57
- 41476612000 GUADALAJARA,J                   20.67 -103.38 1551 1593U 2343HIxxno-9x-9WARM DECIDUOUS  C  115
+ 41476581000 RIO VERDE,S.L                   21.85 -100.00  990 1038S   17HIxxno-9x-9COOL DESERT     A    0
+ 41476632000 PACHUCA,HGO.                    20.13  -98.73 2417 2508U   84MVxxno-9x-9WARM CROPS      C   72
+ 41476640000 TUXPAN.VER.                     20.95  -97.40   28   27S   34FLxxCO 7x-9WARM CROPS      C   25
+ 41476647000 VALLADOLID,YU                   20.70  -88.22   22   15S   15FLxxno-9x-9TROP. SAVANNA   C   24
+ 41476662000 ZAMORA,MICH.                    19.98 -102.32 1562 1733R   -9MVxxno-9A-9WARM CROPS      C   22
+ 41476683000 TLAXCALA,TLAX                   19.32  -98.23 2248 2342S   10HIxxno-9x-9TROP. MONTANE   C   44
+ 41476685000 PUEBLA,PUE.                     19.05  -98.17 2179 2151U  466MVxxno-9x-9TROP. MONTANE   C   94
+ 41476687000 JALAPA,VER.                     19.53  -96.92 1389 1423U  161MVxxno-9x-9WARM CROPS      C   32
+ 41476695000 CAMPECHE,CAMP                   19.85  -90.55    5    8U   70FLxxCO 1x-9WATER           C   47
+ 41476726000 CUERNAVACA,MO                   18.88  -99.23 1618 1720U  240MVxxno-9x-9WARM CROPS      C   34
+ 41476775000 OAXACA,OAX.                     17.07  -96.72 1550 1858U  115MVxxno-9x-9TROP. SAVANNA   C   65
+ 41476845000 SN. CRISTOBAL                   16.73  -92.63 2276 2336S   26MVxxno-9x-9TROP. SEASONAL  C   35
[chiefio@tubularbells analysis]$ 

As “ragged right”:

$ cat Mexico.stuff
[chiefio@tubularbells analysis]$ diff Temps/414.stns1996 Temps/414.stns2009
+ 41476160000 HERMOSILLO,SO 29.07 -110.95 211 225U 233HIxxno-9x-9WARM GRASS/SHRUBC3 77
about 100 km inland from the Gulf of California, north of Guaymas / Ciudad Obregon
+ 41476220000 TEMOSACHIC,CH 28.95 -107.83 1870 1944R -9MVxxno-9x-9WARM DECIDUOUS B2 0
Due south of New Mexico “step” (the dangly bit of New Mexico) in an area I though was desert…
but at 1870 m it is in the mountains.
+ 41476243000 PIEDRAS NEGRA 28.70 -100.52 250 227S 21FLxxno-9A 1WARM GRASS/SHRUBC3 44
On the Tex Mex border WSW from San Antonio
+ 41476311000 CHOIX,SIN. 26.72 -108.28 238 403R -9HIxxno-9x-9TROP. SAVANNA A2 0
About 75 km inland from the Gulf of Mexico between Obregon and Los Mochis
+ 41476373000 TEPEHUANES,DG 25.35 -105.75 1810 2061R -9MVxxno-9x-9WARM DECIDUOUS B2 0
About 200 km inland from the Gulf of Mexico, S. of Lost Mochis, N. of Mazatlan
+ 41476525000 ZACATECAS,ZAC 22.78 -102.57 2612 2421U 50HIxxno-9x-9WARM DECIDUOUS C 57
About 300 km inland from Mazatlan

- 41476612000 GUADALAJARA,J 20.67 -103.38 1551 1593U 2343HIxxno-9x-9WARM DECIDUOUS C 115
About 200 km inland from Puerto Vallarta. Strange to delete it.
+ 41476581000 RIO VERDE,S.L 21.85 -100.00 990 1038S 17HIxxno-9x-9COOL DESERT A 0
About 225 km inland from Tampico, on the Gulf of Mexico side
+ 41476632000 PACHUCA,HGO. 20.13 -98.73 2417 2508U 84MVxxno-9x-9WARM CROPS C 72
About 200 km inland 1/2 way from Tampico to Veracruz, on the Gulf of Mexico side
+ 41476640000 TUXPAN.VER. 20.95 -97.40 28 27S 34FLxxCO 7x-9WARM CROPS C 25
On the Coast, 1/3 from Tampico to Veracruz, on the Gulf of Mexico side
+ 41476647000 VALLADOLID,YU 20.70 -88.22 22 15S 15FLxxno-9x-9TROP. SAVANNA C 24
About 100 km W of Cancun, about 75 km S. of the Gulf of Mexico
+ 41476662000 ZAMORA,MICH. 19.98 -102.32 1562 1733R -9MVxxno-9A-9WARM CROPS C 22
About 100 km SE of Guadalajara. Looks to me like a slighly more southern repleacement for G.
+ 41476683000 TLAXCALA,TLAX 19.32 -98.23 2248 2342S 10HIxxno-9x-9TROP. MONTANE C 44
About 200 km W of Veracruz on a line to Mexico City
+ 41476685000 PUEBLA,PUE. 19.05 -98.17 2179 2151U 466MVxxno-9x-9TROP. MONTANE C 94
About 200 km W of Veracruz
+ 41476687000 JALAPA,VER. 19.53 -96.92 1389 1423U 161MVxxno-9x-9WARM CROPS C 32
About 25 km from the GOM NW of Veracruz
+ 41476695000 CAMPECHE,CAMP 19.85 -90.55 5 8U 70FLxxCO 1x-9WATER C 47
West side of the Yucatan peninsula.
+ 41476726000 CUERNAVACA,MO 18.88 -99.23 1618 1720U 240MVxxno-9x-9WARM CROPS C 34
About 40km S. of Mexico City
+ 41476775000 OAXACA,OAX. 17.07 -96.72 1550 1858U 115MVxxno-9x-9TROP. SAVANNA C 65
About 150 km from the P. Ocean, SSw from Veracruz
+ 41476845000 SN. CRISTOBAL 16.73 -92.63 2276 2336S 26MVxxno-9x-9TROP. SEASONAL C 35
About 100 km from Pacific, Gulf of Mex. and Guatemala
[chiefio@tubularbells analysis]$

So what lead me here, and what is the impact? I was looking at “North America without the USA and Canada”. Yes, that doesn’t leave much. Yet there was this odd step in the data. Dropping out Mexico, the rest of the data is fairly smooth. I know, this only really leaves Central America and the Caribbean, but I’d thought Mexico would have been left alone. Well, it wasn’t. the data only flattened out when Mexico, too, was removed. So what does it look like in “North America minus the U.S.A, Canada, and Mexico”?

There are not a lot of thermometers in the early years, and those are a bit cold. The record warms to about 1900 and stabilizes with some cyclicality to it. It reaches a peak in the ’70s with some more thermometer additions (it might be amusing to see where they were, some other day…), then drops to today. The centroid for all this looks to me to be about 18 C; though you could make a dandy case for “Global COOLING!!!” since 1969 if you tried really hard and had a new computer budget ;-)

[chiefio@tubularbells analysis]$ more Temps/Temps.4.ML.yrs.GAT 

Thermometer Records, Average of Monthly Data and Yearly Average
by Year Across Month, with a count of thermometer records in that year 
--------------------------------------------------------------------------
YEAR  JAN  FEB  MAR  APR  MAY  JUN JULY  AUG SEPT  OCT  NOV  DEC  YR COUNT
--------------------------------------------------------------------------
1880  5.9  3.8  7.1 11.1 13.2 16.0 18.7 17.4 15.8 14.8 10.8  8.4 11.9    9
1881  7.8  4.8  4.0 11.6 14.8 15.3 18.1 17.5 15.6 13.5 10.7  7.3 11.8    9
1882  7.6  8.5  8.6 13.1 16.7 18.1 18.8 19.3 18.0 15.2 12.5 11.1 14.0   10
1883 10.0  8.8 12.3 13.5 16.7 18.7 20.0 18.9 17.7 14.2 12.9  7.3 14.2   10
1884  7.4  7.6  7.1 10.2 15.0 18.3 19.9 18.3 18.6 14.0 14.9 12.3 13.6   10
1885 10.1  7.0  9.6  9.6 14.0 16.8 19.1 20.8 18.3 12.2  9.8  8.2 13.0    8
1886  5.1  4.8  6.6  8.6 14.9 17.2 19.0 18.3 16.6 13.1 10.5  7.6 11.9    8
1887  8.3  7.6  8.4 11.8 15.7 17.7 19.6 19.0 18.2 16.3 16.0 10.9 14.1   10
1888 11.6 11.0 11.6 14.2 17.3 19.9 21.3 21.2 17.4 16.4 13.3  6.4 15.1   11
1889  8.5 10.9  7.1 13.8 16.8 18.4 20.4 19.6 18.4 16.1 12.8 10.1 14.4   10
1890  9.1  8.8  9.4 12.6 16.7 18.9 19.9 19.5 17.7 15.7 12.8 11.3 14.4   10
1891 10.6  8.4 11.4 13.3 17.6 20.2 20.6 21.0 19.1 18.4 14.3 11.6 15.5   12
1892 12.5 12.7 12.9 15.1 18.0 20.0 20.4 20.4 18.8 18.3 15.2 14.3 16.6   13
1893 13.0 12.4 13.1 14.9 17.3 19.8 20.6 20.9 19.7 17.5 16.1 12.6 16.5   13
1894 11.1  9.9 10.4 13.2 19.1 18.8 20.4 20.5 19.1 17.5 14.5 12.5 15.6   13
1895 11.9 12.5 12.4 13.9 16.5 18.7 20.6 20.3 18.4 17.1 13.8 12.1 15.7   15
1896 10.2  9.6 11.2 13.3 16.4 19.3 20.1 19.7 19.6 17.5 14.3 14.1 15.4   15
1897 11.1 10.5 13.0 13.8 16.7 19.4 21.2 19.5 18.6 17.2 14.6 13.0 15.7   15
1898 10.7  9.1 14.6 17.8 17.2 19.5 19.6 19.5 18.5 18.2 13.7 11.2 15.8   15
1899 13.3 14.4 15.6 16.9 19.7 20.5 22.3 20.6 19.3 16.9 14.6 14.7 17.4   19
1900 14.1 15.3 16.1 16.8 19.6 21.0 21.9 22.1 20.3 18.9 16.7 14.2 18.1   19
1901 12.6 15.3 14.9 16.0 18.8 20.2 21.1 21.1 20.3 18.0 16.6 14.7 17.5   18
1902 13.3 15.8 14.1 18.0 18.4 20.8 22.1 21.4 20.3 18.9 16.9 14.9 17.9   19
1903 14.3 13.9 15.2 16.7 18.9 20.7 21.4 21.3 20.6 18.9 17.6 15.7 17.9   19
1904 13.1 13.2 13.6 15.2 18.8 20.4 21.0 21.4 19.8 17.4 16.4 15.5 17.1   18
1905 12.8 13.7 15.4 18.0 19.4 20.7 21.6 21.7 20.1 19.2 17.6 15.0 17.9   19
1906 12.4 11.9 13.4 14.8 18.5 19.8 20.8 21.4 20.0 17.9 15.7 13.4 16.7   17
1907 13.1 12.1 12.5 15.9 18.7 20.4 21.4 21.5 20.3 19.1 16.7 15.7 17.3   19
1908 14.1 13.7 15.4 18.0 19.3 20.6 22.2 21.7 21.2 18.8 17.3 15.6 18.2   20
1909 13.5 14.7 16.5 17.4 19.7 21.0 21.6 21.4 20.9 18.7 17.0 14.2 18.0   20
1910 12.5 11.6 13.1 15.8 18.1 20.1 21.3 21.9 21.2 20.1 18.2 16.7 17.5   19
1911 14.2 13.2 15.2 17.9 19.4 21.4 22.3 22.3 20.3 19.2 17.2 14.7 18.1   18
1912 15.2 15.0 15.4 17.6 19.7 21.0 21.6 21.5 20.6 18.7 17.0 15.7 18.2   19
1913 14.8 15.0 14.4 16.0 18.5 20.6 21.1 20.7 20.3 18.6 15.9 14.4 17.5   19
1914 13.6 12.9 14.1 16.3 18.0 19.2 20.8 20.8 19.5 18.2 15.9 13.7 16.9   18
1915 12.8 12.2 13.6 15.6 19.7 20.8 21.7 21.8 21.0 19.2 17.7 15.9 17.7   17
1916 14.0 14.4 16.6 16.3 19.7 21.0 21.3 21.8 20.5 19.8 18.0 15.4 18.2   18
1917 16.5 15.5 14.3 15.4 17.8 19.7 21.3 21.0 19.5 16.4 15.1 13.3 17.1   18
1918 12.9 12.6 14.5 15.2 18.4 19.5 21.4 21.3 20.3 19.4 17.3 15.6 17.4   19
1919 15.4 14.2 15.9 17.1 21.0 21.0 21.2 21.6 20.1 20.1 18.4 16.3 18.5   20
1920 14.0 14.2 14.8 18.4 20.4 21.4 21.7 21.4 20.5 19.1 16.9 15.8 18.2   20
1921 13.0 13.0 16.4 16.5 19.4 20.9 22.3 21.8 20.6 18.7 18.1 15.4 18.0   19
1922 15.0 13.6 15.9 17.7 19.4 20.3 21.6 21.7 20.8 19.8 17.6 16.7 18.3   20
1923 14.2 15.6 16.1 18.2 20.2 21.3 22.2 22.3 21.1 19.6 18.1 16.8 18.8   20
1924 16.4 15.1 16.2 18.5 20.8 21.9 22.3 23.0 20.7 19.5 17.9 15.9 19.0   20
1925 14.6 14.4 15.8 17.4 19.9 21.3 21.8 22.1 21.3 20.0 18.6 17.2 18.7   20
1926 16.3 16.2 16.4 18.5 20.8 22.0 22.6 22.3 21.3 19.8 18.3 17.1 19.3   20
1927 16.6 16.7 16.8 17.9 21.2 22.4 22.9 23.2 22.3 20.6 18.7 17.0 19.7   19
1928 16.8 16.3 18.1 18.8 20.9 21.7 23.1 23.2 21.9 19.8 17.6 16.2 19.5   20
1929 17.3 16.4 16.9 17.9 19.5 21.0 23.7 22.1 20.8 19.2 16.8 15.2 18.9   20
1930 13.8 14.2 16.6 18.0 20.0 21.0 22.3 22.5 21.9 19.8 17.7 16.4 18.7   20
1931 15.2 14.1 14.6 18.4 19.5 21.0 22.6 23.0 22.0 19.0 16.4 16.8 18.5   23
1932 13.0 16.2 15.6 17.3 19.6 21.1 21.2 22.3 22.6 18.0 15.5 14.5 18.1   25
1933 13.4 13.5 14.4 16.7 19.4 20.2 21.5 21.7 19.8 18.9 16.7 15.8 17.7   25
1934 13.7 14.2 14.1 16.5 18.2 20.4 21.1 21.6 20.0 18.1 16.2 15.5 17.5   25
1935 13.6 12.4 14.9 16.4 18.8 20.3 21.0 20.8 19.9 17.7 16.4 14.5 17.2   25
1936 14.2 14.3 14.1 17.0 19.1 20.4 21.6 21.7 20.0 18.9 16.3 13.8 17.6   25
1937 14.9 14.2 16.7 17.1 20.6 21.2 23.3 23.1 20.9 18.8 17.5 16.0 18.7   24
1938 14.8 15.4 15.4 17.1 19.8 20.8 21.7 21.9 21.1 19.1 17.1 16.1 18.4   26
1939 15.9 14.8 15.9 18.9 20.0 21.2 22.1 22.0 21.5 20.2 17.1 16.5 18.8   26
1940 16.8 17.4 17.9 20.6 20.5 21.8 23.0 22.3 21.9 20.2 19.0 18.5 20.0   24
1941 18.0 17.7 18.7 20.3 21.6 22.7 23.1 23.5 22.6 21.6 19.8 19.1 20.7   27
1942 17.7 17.7 18.8 19.6 21.8 22.7 22.9 22.6 21.8 20.4 19.8 19.1 20.4   27
1943 18.8 17.1 17.9 19.4 21.0 22.0 22.8 23.1 23.2 20.3 19.4 18.4 20.3   28
1944 15.5 16.9 17.8 20.9 21.6 22.9 23.6 23.5 22.6 21.2 19.2 18.4 20.3   26
1945 18.4 18.1 19.9 20.9 22.4 23.7 24.2 24.1 23.5 22.5 19.9 19.1 21.4   30
1946 18.6 18.6 19.6 20.1 22.3 23.1 23.4 23.5 20.6 19.4 18.0 16.9 20.3   33
1947 16.4 16.3 16.2 17.7 20.0 21.4 22.3 22.3 21.3 20.0 18.3 16.4 19.1   33
1948 14.8 14.3 14.8 16.7 19.5 21.6 22.5 22.0 21.0 19.1 17.1 15.0 18.2   35
1949 13.4 13.0 14.3 16.6 19.6 21.2 22.4 21.8 21.0 17.7 16.0 13.2 17.5   40
1950 12.8 12.7 14.0 14.4 17.8 20.6 20.9 20.7 19.2 17.8 15.9 14.7 16.8   40
1951 16.4 15.8 16.5 19.1 21.5 22.8 23.1 23.1 22.4 20.6 20.7 17.2 19.9   74
1952 17.4 17.7 18.4 20.2 22.4 22.8 23.1 23.5 22.4 20.8 19.5 17.7 20.5   92
1953 16.8 16.9 17.1 20.6 22.1 22.9 23.5 23.7 23.0 20.8 19.6 18.3 20.4   95
1954 17.4 17.5 18.4 19.9 22.2 22.7 23.2 23.3 22.2 20.3 19.5 17.2 20.3   95
1955 16.9 17.6 18.4 19.6 22.3 23.0 23.1 23.5 22.6 21.4 19.7 18.3 20.5   96
1956 16.5 18.2 18.3 20.3 21.4 22.5 23.3 23.5 22.4 21.2 19.4 18.4 20.4   99
1957 18.1 18.0 18.9 20.2 22.2 23.2 23.8 23.7 22.8 21.2 20.2 17.9 20.8  100
1958 17.4 17.6 19.7 20.8 22.3 23.3 24.0 23.7 22.8 21.1 19.8 18.5 20.9   97
1959 17.6 17.8 18.6 20.1 21.5 22.8 23.3 23.3 22.6 21.6 20.0 18.3 20.6   97
1960 18.6 18.6 18.2 20.0 22.2 23.0 23.6 23.6 22.6 21.9 20.1 17.8 20.9   98
1961 17.9 17.6 18.3 20.4 21.9 23.4 23.4 23.4 22.1 20.8 19.0 18.2 20.5  110
1962 17.7 17.3 18.7 19.3 21.0 22.5 23.3 23.1 22.6 21.1 19.2 18.0 20.3  109
1963 18.3 17.9 18.7 19.6 21.0 22.5 23.0 23.6 22.5 20.5 19.0 18.9 20.5  108
1964 17.9 19.2 19.0 20.2 22.3 22.9 23.6 23.5 22.6 20.9 19.6 18.5 20.9  109
1965 16.9 19.0 19.3 20.4 21.7 22.9 23.5 23.3 22.8 21.5 19.8 18.6 20.8  108
1966 17.7 18.6 18.4 20.5 21.7 22.8 23.6 23.8 23.0 21.6 19.4 18.4 20.8  109
1967 18.5 18.2 18.2 19.8 22.2 22.9 23.5 23.5 22.8 21.4 19.9 19.0 20.8  108
1968 17.7 17.7 18.2 20.0 22.2 22.9 23.5 23.5 22.8 21.4 20.1 18.9 20.7  108
1969 18.7 19.0 20.0 21.1 22.8 23.5 24.1 23.5 22.8 21.6 20.3 18.9 21.4  110
1970 18.4 18.3 19.3 20.9 21.7 23.0 23.3 23.2 22.5 21.9 19.3 18.7 20.9  110
1971 17.4 17.7 18.4 19.5 21.8 22.8 23.2 22.9 22.2 20.8 19.2 18.2 20.3  116
1972 18.6 18.2 19.0 20.2 22.3 23.0 23.5 23.4 22.8 21.9 20.7 19.4 21.1  116
1973 19.3 18.0 19.8 20.9 22.6 23.2 23.6 23.4 22.9 21.7 20.2 18.3 21.2  114
1974 19.0 18.6 19.7 21.1 22.1 23.1 23.5 23.5 22.6 21.3 20.1 18.6 21.1  113
1975 18.5 19.0 19.8 21.3 22.6 23.4 23.4 23.4 22.3 21.4 19.8 18.0 21.1  113
1976 17.5 17.8 19.3 20.3 22.1 22.6 23.5 23.4 23.2 22.0 20.8 19.9 21.0  113
1977 18.9 19.3 20.1 20.9 22.4 23.1 23.7 25.6 23.0 21.9 20.9 19.8 21.6  113
1978 18.0 18.3 19.2 21.1 22.6 23.1 23.4 23.5 22.8 21.6 20.1 20.1 21.2  113
1979 18.7 18.7 19.5 21.0 22.1 23.0 23.5 23.5 22.5 21.9 20.6 19.2 21.2  113
1980 19.6 19.0 20.0 20.9 22.6 23.2 23.8 23.7 23.4 22.0 20.8 19.2 21.5  113
1981 15.7 17.4 18.4 20.5 22.4 23.1 23.9 24.1 23.4 22.1 19.0 17.7 20.6   65
1982 22.4 14.4 14.8 17.5 19.2 21.4 21.4 20.8 19.4 18.1 16.9 16.3 18.6   43
1983 13.7 14.3 15.3 17.2 20.8 21.9 20.7 21.0 19.3 17.1 15.8 15.5 17.7   43
1984 14.3 16.8 15.9 17.9 20.6 21.5 21.3 20.5 20.9 16.8 16.3 16.1 18.2   45
1985 15.2 14.2 14.3 16.5 18.9 19.9 20.5 21.4 20.3 17.9 15.2 14.4 17.4   44
1986 14.8 16.0 15.6 19.2 19.8 21.9 21.3 22.4 21.1 18.5 17.2 16.1 18.7   39
1987 15.7 16.4 16.1 17.4 20.1 21.9 22.2 22.9 22.4 20.1 18.7 17.2 19.3   42
1988 13.4 14.5 14.8 15.9 19.3 20.2 24.7 20.6 20.3 19.0 16.3 14.7 17.8   41
1989 14.5 12.8 12.7 16.3 18.0 18.7 20.7 19.9 17.6 16.4 14.9 12.8 16.3   37
1990 13.5 11.5 12.1 16.3 19.5 21.9 22.0 22.0 20.7 17.1 15.8 12.3 17.1   40
1991 12.5 14.7 16.2 14.7 18.1 19.4 21.0 22.2 18.7 17.6 13.9 14.7 17.0   34
1992 14.1 11.2 14.3 15.6 18.9 19.6 21.4 21.1 19.6 18.5 17.2 14.9 17.2   30
1993 14.5 12.3 13.1 16.4 18.9 19.7 21.9 22.1 21.4 18.9 15.7 14.5 17.4   31
1994 15.3 13.4 13.3 16.5 18.6 19.7 21.9 20.7 20.6 18.1 15.6 13.2 17.2   30
1995 14.3 13.3 13.9 16.9 17.7 19.2 22.5 21.9 20.1 17.0 15.7 13.6 17.2   28
1996 14.7 13.3 15.9 17.7 19.3 18.7 20.9 21.2 19.6 18.2 16.0 13.9 17.5   28
1997 14.7 15.2 14.4 17.0 18.8 21.1 20.1 21.3 21.8 18.7 16.4 16.1 18.0   28
1998 15.7 14.1 15.8 17.4 19.3 21.3 22.1 21.7 20.8 17.1 17.3 15.0 18.1   25
1999 14.2 13.7 16.1 17.2 19.0 20.2 21.1 21.7 19.8 18.4 16.2 14.3 17.7   26
2000 13.3 13.4 14.4 16.5 17.3 20.0 20.4 21.0 19.8 16.1 15.4 13.2 16.7   25
2001 13.4 11.9 14.1 15.1 17.7 20.8 21.5 21.8 20.9 19.1 16.9 16.7 17.5   27
2002 15.8 14.3 14.8 16.5 20.3 21.9 21.8 21.6 21.5 21.9 18.0 17.5 18.8   26
2003 16.6 17.2 17.4 17.1 19.6 21.4 22.8 22.7 21.2 20.5 18.2 17.4 19.3   26
2004 17.0 16.7 16.5 18.4 19.1 20.7 22.0 21.8 21.0 18.9 17.2 18.1 18.9   23
2005 17.2 16.0 17.9 18.8 22.1 21.6 22.5 22.0 21.0 16.4 15.3 15.6 18.9   22
2006 13.2 11.9 14.5 16.6 17.2 21.0 20.8 20.3 19.0 16.8 14.3 14.7 16.7   23
2007 13.5 14.6 16.8 19.3 20.8 20.6 22.5 21.2 20.6 18.6 15.6 15.2 18.3   24
2008 17.5 18.0 16.2 18.7 20.7 22.4 24.8 22.5 20.2 17.3 16.9  8.4 18.6   26
     16.7 16.8 17.5 19.2 21.1 22.2 22.9 22.9 21.9 20.4 18.8 17.4 19.8
     14.8 14.6 15.5 17.4 19.7 21.1 22.0 21.9 20.8 19.0 17.1 15.5 18.3
 
For Country Code 4 minus 414 425 403
[chiefio@tubularbells analysis]$ 

.
OK, we’ve “discovered” that thermometer count strongly influences the “rest of North America” and other than that, not much is happening. It might be cooling, given what the data say, but really would need a more stable selection of thermometers and a better correction for latitude to be sure.

We already know that Canada has had the record cooked by thermometer changes and deletions, and we know that the USA is just “Like, totally toasted, Mann!” because of a 90% deletion of thermometers that left all of 4 of them in California: 1 in San Francisco and 3 near or on The Beach in Southern California. So what happened to the temperature averages in Mexico as the thermometers moved?

Mexico, the Temperature History in GHCN

What does Mexico look like? The decade changes by latitude look like this:

This is the usual South Pole on the left, North Pole on the right.

Look at ./Lats/Therm.by.lat414.Dec.LAT (Y/N)? y
 
       Year SP  15    17    19    21    23    25    27    29    31   -NP
DecPct: 1879   0.0   0.0   0.0 100.0   0.0   0.0   0.0   0.0   0.0   0.0 100.0
DecPct: 1889   0.0   0.0   0.0  62.1   3.4  34.5   0.0   0.0   0.0   0.0 100.0
DecPct: 1899   0.0   0.0   0.0  53.7  22.0  24.4   0.0   0.0   0.0   0.0 100.0
DecPct: 1909   0.0   0.0   0.0  52.0  18.0  20.0  10.0   0.0   0.0   0.0 100.0
DecPct: 1919   0.0   0.0   0.0  63.8  10.6   4.3  21.3   0.0   0.0   0.0 100.0
DecPct: 1929   0.0   0.0   5.4  37.6  13.8   8.1  26.8   8.4   0.0   0.0 100.0
DecPct: 1939   0.0   0.0   4.8  31.3  14.1  11.6  25.4  12.9   0.0   0.0 100.0 
DecPct: 1949   0.1   2.7   5.8  23.9  10.9  13.7  20.3  18.0   3.8   0.9 100.0
DecPct: 1959   1.4   5.6   8.6  23.2  12.9  12.7  17.2  14.0   3.0   1.4 100.0
DecPct: 1969   1.3   5.4   9.1  23.2  12.6  12.1  17.3  14.7   3.0   1.3 100.0
DecPct: 1979   1.8   6.0   8.2  25.8  12.5  11.9  16.2  13.6   3.0   0.9 100.0
DecPct: 1989   2.2   8.4  11.2  24.5  12.8  11.6  14.8  11.9   2.2   0.5 100.0
DecPct: 1999   3.3   7.1  11.7  27.9  18.8   7.5  18.3   5.4   0.0   0.0 100.0
DecPct: 2009   3.5   5.2   8.4  33.2  15.7   7.3  19.9   5.9   0.7   0.0 100.0
 
For COUNTRY CODE: 414
 
  

Aside from the usual “start with one and spread out” effect, and the general looting of the North to send things to the South that starts about 1940; the “juice” shows up in the changes in 1999 onward (though some is showing up in 1989 already…). The far north is emptied, the 21 degree band tries to regain it’s prior glory, and the deep south gains a bit. While it might be interesting to look at all the changes in different decades, I think the pattern is clearly shown by the example up top.

The data format of those records in the example up top is described here, about 1/2 way down:

http://chiefio.wordpress.com/2009/02/24/ghcn-global-historical-climate-network/

For the “terminally curious”, here are the detail changes in percentages by year from about 1940 onward:


DecPct: 1929   0.0   0.0   5.4  37.6  13.8   8.1  26.8   8.4   0.0   0.0 100.0
 
LATpct: 1930   0.0   0.0   7.5  32.5  15.0   7.5  27.5  10.0   0.0   0.0 100.0
LATpct: 1931   0.0   0.0   5.0  32.5  17.5   7.5  27.5  10.0   0.0   0.0 100.0
LATpct: 1932   0.0   0.0   5.0  30.0  17.5  10.0  27.5  10.0   0.0   0.0 100.0
LATpct: 1933   0.0   0.0   4.8  28.6  14.3  14.3  26.2  11.9   0.0   0.0 100.0
LATpct: 1934   0.0   0.0   4.5  31.8  13.6  13.6  25.0  11.4   0.0   0.0 100.0
LATpct: 1935   0.0   0.0   4.4  31.1  13.3  13.3  24.4  13.3   0.0   0.0 100.0
LATpct: 1936   0.0   0.0   4.3  32.6  13.0  10.9  23.9  15.2   0.0   0.0 100.0
LATpct: 1937   0.0   0.0   4.3  31.9  12.8  12.8  23.4  14.9   0.0   0.0 100.0
LATpct: 1938   0.0   0.0   4.3  31.9  12.8  10.6  25.5  14.9   0.0   0.0 100.0
LATpct: 1939   0.0   0.0   4.0  30.0  12.0  14.0  24.0  16.0   0.0   0.0 100.0
 
DecPct: 1939   0.0   0.0   4.8  31.3  14.1  11.6  25.4  12.9   0.0   0.0 100.0
 
LATpct: 1940   0.0   0.0   4.2  31.2  12.5  14.6  20.8  16.7   0.0   0.0 100.0
LATpct: 1941   0.0   3.2   3.2  25.8   9.7  11.3  22.6  21.0   3.2   0.0 100.0
LATpct: 1942   0.0   2.9   4.3  24.3  11.4  12.9  21.4  18.6   4.3   0.0 100.0
LATpct: 1943   0.0   2.7   4.0  22.7  10.7  13.3  22.7  18.7   4.0   1.3 100.0
LATpct: 1944   0.0   2.6   3.8  21.8  11.5  14.1  21.8  19.2   3.8   1.3 100.0
LATpct: 1945   0.0   2.5   3.8  22.5  11.2  13.8  21.2  20.0   3.8   1.2 100.0
LATpct: 1946   0.0   2.4   4.7  23.5  10.6  12.9  20.0  20.0   4.7   1.2 100.0
LATpct: 1947   0.0   2.3   6.8  22.7  10.2  13.6  19.3  19.3   4.5   1.1 100.0
LATpct: 1948   0.0   2.2   9.8  23.9   9.8  15.2  18.5  15.2   4.3   1.1 100.0
LATpct: 1949   0.9   4.5   9.8  24.1  11.6  14.3  17.0  13.4   3.6   0.9 100.0
 
DecPct: 1949   0.1   2.7   5.8  23.9  10.9  13.7  20.3  18.0   3.8   0.9 100.0
 
LATpct: 1950   0.9   4.3   9.5  23.3  12.1  13.8  17.2  14.7   3.4   0.9 100.0
LATpct: 1951   1.5   5.1   8.8  23.5  13.2  12.5  16.2  14.7   2.9   1.5 100.0
LATpct: 1952   1.4   5.8   8.7  23.2  13.0  11.6  17.4  14.5   2.9   1.4 100.0
LATpct: 1953   1.4   5.8   7.9  23.0  12.9  12.9  17.3  14.4   2.9   1.4 100.0
LATpct: 1954   1.4   5.8   8.6  23.0  12.9  12.9  17.3  13.7   2.9   1.4 100.0
LATpct: 1955   1.4   5.8   9.4  23.0  12.9  12.2  17.3  13.7   2.9   1.4 100.0
LATpct: 1956   1.4   5.7   9.3  22.9  12.9  12.9  17.1  13.6   2.9   1.4 100.0
LATpct: 1957   1.4   5.8   8.0  23.2  13.0  13.0  17.4  13.8   2.9   1.4 100.0
LATpct: 1958   1.5   5.8   8.0  23.4  13.1  13.1  17.5  13.1   2.9   1.5 100.0
LATpct: 1959   1.4   5.8   8.0  23.2  13.0  12.3  17.4  13.8   3.6   1.4 100.0
 
DecPct: 1959   1.4   5.6   8.6  23.2  12.9  12.7  17.2  14.0   3.0   1.4 100.0
 
LATpct: 1960   1.4   5.8   7.9  23.0  12.9  12.9  17.3  13.7   3.6   1.4 100.0
LATpct: 1961   1.4   5.4   8.1  23.6  12.8  12.2  17.6  14.2   3.4   1.4 100.0
LATpct: 1962   1.3   5.3   9.3  23.3  12.7  12.0  17.3  14.0   3.3   1.3 100.0
LATpct: 1963   1.3   5.3   9.3  23.3  12.7  12.0  16.7  14.7   3.3   1.3 100.0
LATpct: 1964   1.3   5.3   9.3  23.3  12.7  12.0  17.3  14.7   2.7   1.3 100.0
LATpct: 1965   1.3   5.3   9.3  23.3  12.7  12.0  17.3  14.7   2.7   1.3 100.0
LATpct: 1966   1.3   5.3   9.3  22.7  12.7  12.0  17.3  15.3   2.7   1.3 100.0
LATpct: 1967   1.3   5.3   9.3  23.2  12.6  11.9  17.2  15.2   2.6   1.3 100.0
LATpct: 1968   1.3   5.3   9.3  23.2  12.6  11.9  17.2  15.2   2.6   1.3 100.0
LATpct: 1969   1.3   5.3   9.3  23.3  12.0  12.0  17.3  15.3   2.7   1.3 100.0
 
DecPct: 1969   1.3   5.4   9.1  23.2  12.6  12.1  17.3  14.7   3.0   1.3 100.0
 
LATpct: 1970   1.3   5.3   9.3  23.8  11.9  11.9  17.2  15.2   2.6   1.3 100.0
LATpct: 1971   1.8   6.0   7.8  25.9  12.7  12.0  16.3  13.3   3.0   1.2 100.0
LATpct: 1972   1.8   6.1   7.9  25.5  12.7  12.1  16.4  13.3   3.0   1.2 100.0
LATpct: 1973   1.8   6.0   8.4  26.5  12.7  12.0  15.7  13.3   3.0   0.6 100.0
LATpct: 1974   1.8   6.1   8.0  25.2  12.9  12.3  16.6  13.5   3.1   0.6 100.0
LATpct: 1975   1.8   6.1   8.5  25.5  12.7  12.1  16.4  13.3   3.0   0.6 100.0
LATpct: 1976   1.8   6.1   8.5  26.2  12.2  11.6  16.5  13.4   3.0   0.6 100.0
LATpct: 1977   1.8   6.1   7.9  26.8  12.2  11.6  15.9  13.4   3.0   1.2 100.0
LATpct: 1978   1.8   6.1   8.0  26.4  12.3  11.7  16.0  13.5   3.1   1.2 100.0
LATpct: 1979   1.9   6.2   8.1  26.2  12.5  11.9  15.6  13.8   3.1   0.6 100.0
 
DecPct: 1979   1.8   6.0   8.2  25.8  12.5  11.9  16.2  13.6   3.0   0.9 100.0
 
LATpct: 1980   1.8   6.1   8.6  26.4  12.3  11.7  16.0  13.5   3.1   0.6 100.0
LATpct: 1981   1.6   4.7  10.2  25.2  11.0  11.0  17.3  15.0   3.1   0.8 100.0
LATpct: 1982   1.8   5.3  11.5  22.1  10.6  12.4  16.8  15.0   3.5   0.9 100.0
LATpct: 1983   1.8   5.4  11.7  22.5  10.8  12.6  15.3  15.3   3.6   0.9 100.0
LATpct: 1984   2.6  10.4  10.4  24.7  11.7  11.7  13.0  14.3   1.3   0.0 100.0
LATpct: 1985   4.7  16.3  14.0  27.9  14.0   9.3   9.3   4.7   0.0   0.0 100.0
LATpct: 1986   5.1  15.4  12.8  23.1  15.4  10.3  12.8   5.1   0.0   0.0 100.0
LATpct: 1987   1.9  13.0  13.0  24.1  16.7  11.1  14.8   5.6   0.0   0.0 100.0
LATpct: 1988   1.9  13.5  13.5  25.0  17.3  11.5  11.5   5.8   0.0   0.0 100.0
LATpct: 1989   1.9  13.5  13.5  25.0  17.3  11.5  11.5   5.8   0.0   0.0 100.0
 
DecPct: 1989   2.2   8.4  11.2  24.5  12.8  11.6  14.8  11.9   2.2   0.5 100.0
 
LATpct: 1990   2.1  14.9  14.9  27.7  19.1   2.1  12.8   6.4   0.0   0.0 100.0
LATpct: 1991   5.6   2.8  13.9  27.8  22.2   5.6  16.7   5.6   0.0   0.0 100.0
LATpct: 1992   0.0   0.0   7.1  28.6  28.6   7.1  21.4   7.1   0.0   0.0 100.0
LATpct: 1993   0.0   6.2  12.5  31.2  12.5  12.5  18.8   6.2   0.0   0.0 100.0
LATpct: 1994   4.2   4.2   8.3  29.2  20.8   8.3  20.8   4.2   0.0   0.0 100.0
LATpct: 1995   0.0   5.9  17.6  23.5  17.6  11.8  17.6   5.9   0.0   0.0 100.0
LATpct: 1996   5.0   5.0  10.0  30.0  15.0  10.0  20.0   5.0   0.0   0.0 100.0
LATpct: 1997   5.0   5.0  10.0  30.0  15.0  10.0  20.0   5.0   0.0   0.0 100.0
LATpct: 1998   4.5   9.1   9.1  22.7  22.7   9.1  18.2   4.5   0.0   0.0 100.0
LATpct: 1999   4.2   8.3   8.3  29.2  12.5   8.3  25.0   4.2   0.0   0.0 100.0
 
DecPct: 1999   3.3   7.1  11.7  27.9  18.8   7.5  18.3   5.4   0.0   0.0 100.0
 
LATpct: 2000   4.8   4.8   4.8  33.3  14.3   9.5  23.8   4.8   0.0   0.0 100.0
LATpct: 2001   4.3   4.3   8.7  30.4  17.4   8.7  21.7   4.3   0.0   0.0 100.0
LATpct: 2002   4.2   4.2   8.3  29.2  16.7   8.3  25.0   4.2   0.0   0.0 100.0
LATpct: 2003   4.5   4.5   4.5  31.8  18.2   9.1  22.7   4.5   0.0   0.0 100.0
LATpct: 2004   4.3   4.3   4.3  30.4  17.4   8.7  26.1   4.3   0.0   0.0 100.0
LATpct: 2005   3.0   6.1   9.1  33.3  18.2   6.1  18.2   6.1   0.0   0.0 100.0
LATpct: 2006   3.1   6.2   9.4  34.4  15.6   6.2  18.8   6.2   0.0   0.0 100.0
LATpct: 2007   3.0   6.1   9.1  36.4  15.2   6.1  18.2   6.1   0.0   0.0 100.0
LATpct: 2008   2.6   5.3  10.5  34.2  13.2   7.9  15.8   7.9   2.6   0.0 100.0
LATpct: 2009   2.7   5.4  10.8  35.1  13.5   5.4  16.2   8.1   2.7   0.0 100.0
 
DecPct: 2009   3.5   5.2   8.4  33.2  15.7   7.3  19.9   5.9   0.7   0.0 100.0
 
For COUNTRY CODE: 414

The Mexico Temperature Series

Same as the others. Year, 12 monthly averages of the daily MIN-MAX average, the average of those daily values over the whole year, and the number of thermometer locations (ignoring modification flag) in use in that year.

[chiefio@tubularbells analysis]$ cat Temps/Temps.414.yrs.GAT 

Thermometer Records, Average of Monthly Data and Yearly Average
by Year Across Month, with a count of thermometer records in that year 
--------------------------------------------------------------------------
YEAR  JAN  FEB  MAR  APR  MAY  JUN JULY  AUG SEPT  OCT  NOV  DEC  YR COUNT
--------------------------------------------------------------------------
1880 14.2 15.0 17.6 18.9 20.9 20.8 20.6 20.6 20.1 18.9 18.1 16.0 18.5   3
1881 14.3 15.7 17.7 19.8 20.8 21.4 21.0 20.8 20.1 19.6 17.7 15.4 18.7   3
1882 14.9 15.6 18.0 19.6 20.1 20.8 20.7 20.0 20.2 19.5 16.5 14.8 18.4   3
1883 14.3 15.0 16.6 19.0 19.7 20.5 20.3 20.5 20.1 19.5 17.4 15.4 18.2   3
1884 14.3 15.6 17.8 19.1 20.8 21.4 20.8 20.2 20.4 18.7 16.9 15.6 18.5   3
1885 14.9 15.9 18.2 19.0 20.2 21.4 20.6 20.6 20.5 19.1 17.3 15.8 18.6   3
1886 15.0 15.5 18.3 19.1 21.0 21.0 20.9 20.9 20.2 19.0 13.6 14.0 18.2   3
1887 15.1 16.6 17.7 18.9 20.8 22.0 21.9 22.4 21.9 20.2 18.2 15.8 19.3   2
1888 15.0 16.0 17.8 16.9 21.0 20.9 21.2 21.4 20.0 20.0 14.5 15.4 18.3   3
1889 16.1 17.9 18.0 21.0 20.8 21.3 22.9 22.4 21.5 19.8 18.2 16.1 19.7   3
1890 16.1 15.9 17.2 20.3 20.1 21.0 20.9 20.7 20.2 20.2 16.6 14.9 18.7   4
1891 16.1 17.9 18.9 19.9 21.9 22.5 23.2 23.0 22.7 27.8 19.3 16.4 20.8   2
1892 14.2 16.4 17.2 20.3 21.7 21.8 21.2 20.7 20.1 18.6 13.5 14.7 18.4   4
1893 13.5 16.3 17.0 20.9 20.9 20.7 20.0 20.7 20.5 18.5 16.6 13.9 18.3   4
1894 14.7 15.6 16.7 19.7 21.4 21.8 20.8 20.8 20.6 19.0 16.3 15.1 18.5   4
1895 16.2 16.6 19.5 21.4 22.9 23.0 22.4 22.6 22.0 20.1 19.1 16.2 20.2   5
1896 16.4 16.7 19.8 22.0 23.7 23.4 22.8 22.6 22.1 21.2 19.5 16.3 20.5   5
1897 16.9 17.8 21.1 22.0 22.7 22.9 22.2 22.7 21.3 21.0 19.1 17.0 20.6   5
1898 17.6 17.5 20.8 21.7 23.7 23.2 22.8 22.8 22.7 21.0 19.8 17.3 20.9   4
1899 13.9 15.0 18.2 19.8 21.8 20.6 21.1 21.2 20.1 19.3 16.9 15.4 18.6   4
1900 16.8 18.2 19.5 21.5 22.6 24.8 22.1 22.4 22.1 21.4 18.8 16.6 20.6   5
1901 16.2 16.6 18.4 20.1 22.2 23.1 22.1 22.0 21.7 19.9 17.6 15.0 19.6   3
1902 15.8 17.2 19.2 21.7 22.9 23.2 21.8 21.1 22.1 20.4 19.0 16.7 20.1   5
1903 16.1 18.1 19.6 21.7 22.5 22.3 22.1 21.6 21.6 19.8 18.0 16.3 20.0   5
1904 14.8 15.2 17.1 18.7 19.5 20.4 19.9 20.0 20.1 18.9 17.0 15.4 18.1   3
1905 14.0 15.2 16.9 20.0 23.3 22.7 22.4 22.8 21.3 20.5 18.7 13.7 19.3   5
1906 15.1 15.8 19.2 21.3 23.4 23.9 23.4 22.6 22.5 20.7 18.2 16.1 20.2   6
1907 16.9 17.3 20.1 21.4 22.7 23.6 22.9 22.8 22.4 21.1 18.4 16.4 20.5   6
1908 16.5 17.7 20.7 22.0 23.2 24.1 22.7 23.0 22.2 20.3 17.9 16.6 20.6   6
1909 16.0 17.2 20.4 21.6 24.0 23.7 23.3 22.5 21.2 20.5 18.7 15.8 20.4   6
1910 15.1 16.5 18.1 20.8 22.4 22.8 22.4 22.8 21.6 20.1 18.3 15.7 19.7   6
1911 16.5 17.7 19.6 21.6 21.3 23.4 22.1 23.1 22.7 20.8 18.8 16.4 20.3   6
1912 15.2 15.1 19.6 22.5 22.9 21.3 21.4 21.8 20.8 19.5 15.5 15.5 19.3   5
1913 15.2 16.7 18.9 19.5 21.2 20.8 22.5 21.7 20.5 19.0 17.1 15.4 19.0   5
1914 16.0 17.4 18.4 21.2 22.5 22.5 22.9 23.0 21.6 20.6 17.7 16.0 20.0   4
1915 15.8 17.6 17.0 21.2 25.3 25.4 24.3 24.2 22.5 20.7 18.8 17.1 20.8   3
1916 18.2 18.1 20.5 22.0 24.1 24.7 23.4 22.6 21.8 18.9 16.4 16.3 20.6   4
1917 13.5 15.3 16.8 18.3 20.1 19.6 18.9 19.3 18.2 16.4 13.0 13.0 16.9   4
1918 14.4 17.1 17.9 20.5 21.6 20.6 20.7 20.4 19.8 19.4 16.6 15.2 18.7   5
1919 13.0 16.6 17.9 19.6 22.0 21.2 20.3 22.1 20.2 19.6 17.1 15.3 18.7   5
1920 15.0 17.6 19.5 22.5 21.9 21.2 22.0 21.9 21.6 19.6 17.3 16.0 19.7   4
1921 17.3 17.4 20.8 22.2 23.4 24.8 23.7 24.0 23.2 21.5 19.7 17.6 21.3  19
1922 16.1 19.0 19.7 22.5 24.0 23.3 23.3 23.6 22.3 20.6 18.4 16.6 20.8  24
1923 16.9 16.8 18.3 21.7 24.4 24.2 23.1 23.3 22.6 19.9 17.4 15.4 20.3  26
1924 13.5 15.1 18.4 20.6 22.6 24.6 24.3 24.5 22.2 20.8 18.4 15.6 20.0  26
1925 15.3 17.7 19.4 22.0 22.9 23.7 23.8 23.4 22.6 21.3 18.0 14.3 20.4  27
1926 14.5 17.3 19.3 20.6 22.4 24.0 23.6 23.5 23.2 21.6 17.7 16.5 20.4  33
1927 15.7 17.5 19.4 21.7 24.8 24.1 23.7 24.1 23.3 21.3 19.3 15.9 20.9  37
1928 15.6 16.9 19.8 21.2 23.4 25.5 24.5 24.4 22.7 22.1 17.9 15.6 20.8  37
1929 16.3 17.2 19.8 23.3 24.1 25.1 24.1 24.0 23.6 21.4 17.9 16.5 21.1  38
1930 15.8 18.0 19.4 21.9 24.2 24.4 24.3 24.6 24.6 21.7 18.1 15.6 21.1  37
1931 14.9 16.8 18.0 20.3 22.9 24.7 24.2 23.6 23.6 22.5 19.0 16.1 20.6  37
1932 16.1 18.8 18.0 21.8 24.0 25.8 24.7 24.8 23.2 21.2 17.0 15.9 20.9  37
1933 16.5 17.4 20.3 22.6 24.6 24.7 24.9 24.0 23.6 21.9 18.4 17.0 21.3  39
1934 15.7 17.2 18.6 21.3 23.3 25.1 24.4 24.3 23.7 22.1 19.5 17.4 21.1  41
1935 16.9 16.0 20.1 22.6 23.8 24.7 24.6 24.3 23.5 22.3 19.3 16.4 21.2  42
1936 16.4 17.6 20.1 21.5 23.3 25.5 24.4 24.3 23.3 21.2 18.4 16.4 21.0  43
1937 17.5 18.0 19.0 22.0 23.5 25.2 24.3 24.7 23.8 22.2 19.1 16.7 21.3  44
1938 16.1 17.7 20.7 21.5 23.6 24.3 24.3 24.4 23.1 21.7 18.5 15.9 21.0  42
1939 15.8 16.5 19.9 21.6 23.8 24.8 24.9 24.9 23.2 22.0 18.1 17.1 21.0  45
1940 14.6 16.8 19.2 21.6 23.4 24.8 25.0 24.8 23.7 21.9 18.8 16.9 21.0  44
1941 15.7 16.9 18.3 21.8 23.4 24.9 25.2 24.9 24.0 22.5 19.1 16.3 21.1  55
1942 15.9 16.9 18.8 21.5 24.7 25.7 25.3 24.7 23.6 21.9 19.4 16.9 21.3  63
1943 15.5 17.6 19.8 22.3 24.9 25.2 25.9 26.3 24.3 21.4 17.8 15.6 21.4  68
1944 14.5 18.0 19.0 22.2 23.8 25.7 26.3 26.0 24.1 21.5 18.6 15.5 21.3  71
1945 16.1 17.5 20.6 21.9 24.6 26.7 26.2 26.0 25.1 22.1 19.7 16.6 21.9  73
1946 15.3 17.4 20.1 23.2 25.2 26.5 26.4 25.8 25.4 22.8 19.2 16.9 22.0  77
1947 15.7 16.7 19.6 22.4 24.5 26.6 26.7 25.1 24.6 23.4 19.1 16.3 21.7  79
1948 15.6 18.2 20.2 23.6 25.2 26.6 26.2 26.3 24.7 22.2 19.3 18.5 22.2  83
1949 16.3 18.6 21.3 22.2 25.3 26.3 26.0 26.1 25.3 23.0 19.1 17.8 22.3  94
1950 18.6 18.9 20.7 23.2 25.3 26.2 25.4 26.1 25.5 23.6 19.5 17.2 22.5  95
1951 16.6 17.5 20.0 22.6 24.4 26.5 26.0 26.1 25.0 23.1 19.9 18.5 22.2 100
1952 18.6 18.3 20.0 21.8 24.5 25.5 25.5 25.9 25.0 21.9 19.6 16.6 21.9 102
1953 17.1 18.1 21.6 23.4 24.9 26.8 26.4 26.2 24.6 22.7 19.0 15.9 22.2 102
1954 17.6 19.0 20.7 23.4 24.5 25.9 25.4 25.5 25.0 22.8 19.1 17.1 22.2 101
1955 16.0 17.2 20.9 23.3 25.0 26.2 25.1 25.1 24.1 21.9 19.4 17.1 21.8 102
1956 16.4 18.0 20.7 22.6 24.7 25.6 25.3 25.7 24.5 23.2 18.9 17.2 21.9 102
1957 18.3 20.0 19.8 22.5 24.4 26.4 26.7 26.2 25.2 22.3 19.3 17.7 22.4 101
1958 15.3 17.5 19.4 23.5 25.2 26.4 26.1 26.0 24.8 22.3 19.9 17.1 22.0 100
1959 16.7 18.5 19.8 22.5 24.9 26.3 25.9 25.7 25.3 23.0 18.9 17.0 22.0 102
1960 16.8 16.2 20.0 22.6 24.9 27.0 26.4 26.0 24.8 23.6 20.4 15.9 22.1 102
1961 15.8 17.3 20.2 22.8 25.5 25.7 25.2 25.2 24.5 22.4 18.9 17.3 21.7 103
1962 15.6 19.4 19.5 22.5 24.7 25.9 26.2 26.3 24.9 23.5 19.6 17.1 22.1 104
1963 16.4 17.4 20.9 23.8 25.0 26.0 25.9 25.6 24.9 22.4 19.3 15.8 21.9 104
1964 15.7 16.7 19.8 23.4 24.8 25.3 26.0 25.9 24.8 21.8 19.5 16.9 21.7 104
1965 16.8 16.7 19.1 23.2 24.8 25.8 25.9 25.3 24.9 21.8 20.9 17.5 21.9 104
1966 14.7 16.4 19.1 22.6 24.6 25.7 26.0 25.4 24.7 21.9 19.1 16.4 21.4 104
1967 15.7 17.3 20.8 23.3 25.1 25.9 26.0 25.2 24.0 21.8 19.7 16.7 21.8 105
1968 16.3 16.9 18.3 22.3 24.7 25.9 25.3 25.5 24.3 23.0 18.8 17.1 21.5 105
1969 17.5 17.9 18.8 23.0 24.7 26.4 26.5 25.9 24.8 22.7 19.1 17.0 22.0 104
1970 15.6 17.2 19.2 23.1 24.1 25.5 25.5 25.8 24.2 22.0 18.5 18.3 21.6 105
1971 17.7 18.1 20.8 21.8 24.5 25.2 25.2 24.4 24.4 22.3 19.8 18.3 21.9 113
1972 17.7 17.8 21.4 23.8 24.7 25.5 25.2 24.9 24.9 23.1 20.0 17.7 22.2 113
1973 16.3 17.4 20.9 22.0 24.9 25.5 25.6 24.8 24.8 22.6 20.6 16.6 21.8 111
1974 17.8 17.9 21.0 22.9 24.9 26.1 24.8 25.5 24.1 21.9 19.0 16.6 21.9 112
1975 16.8 18.1 20.6 22.7 24.5 25.4 24.7 25.1 23.5 21.9 19.4 16.4 21.6 112
1976 16.0 18.3 20.6 21.9 23.7 25.8 24.4 25.0 24.2 21.1 17.7 16.1 21.2 111
1977 16.2 17.6 19.8 21.6 24.2 25.8 25.5 25.8 25.3 23.1 19.9 18.2 21.9 111
1978 16.5 16.6 19.9 22.7 25.2 26.3 26.3 25.5 24.5 22.0 20.0 17.6 21.9 111
1979 16.2 17.5 20.2 23.0 24.1 25.7 26.5 25.1 24.2 23.1 18.7 17.3 21.8 109
1980 16.8 17.9 20.9 22.2 25.2 27.0 26.8 25.4 24.8 22.1 18.5 17.2 22.1 111
1981 15.4 17.8 19.5 22.5 24.3 25.8 25.7 25.6 24.6 22.6 19.7 17.9 21.8  94
1982 16.8 18.0 20.8 23.8 24.3 26.7 26.1 26.4 25.5 22.4 18.8 16.2 22.1  88
1983 15.6 16.5 19.3 21.7 25.0 26.3 25.9 25.5 24.9 22.6 19.6 16.8 21.6  87
1984 15.5 17.6 20.2 22.0 23.7 23.8 23.5 23.7 22.4 21.7 19.5 18.9 21.0  55
1985 18.4 19.2 21.4 22.0 24.3 23.7 24.2 20.9 20.2 22.3 20.7 18.1 21.3  24
1986 15.6 19.1 20.2 23.8 22.8 23.2 23.7 15.9 22.6 22.5 19.7 13.7 20.2  24
1987 17.2 18.7 19.1 22.2 23.9 25.2 24.5 25.6 24.4 22.9 20.8 19.8 22.0  22
1988 17.5 18.7 20.8 23.2 24.2 24.8 24.1 24.5-99.0 23.6 21.1 18.4 21.9  21
1989 18.6 18.9 21.5 23.1 25.3 26.7 24.2 25.0 21.4 23.7 23.5 17.8 22.5  21
1990 17.8 19.8 21.8 22.8 27.5 24.9 23.4 27.7 16.8 21.7 19.8 17.8 21.8  20
1991 19.7 19.4 22.5 24.0-99.0 29.7-99.0-99.0 26.1 19.9 19.9 17.5 22.1  21
1992 16.3 17.9 18.1-99.0-99.0-99.0-99.0-99.0-99.0-99.0-99.0-99.0 17.4  14
1993-99.0 19.7-99.0 18.3-99.0-99.0 26.4-99.0-99.0-99.0-99.0 23.4 22.0  16
1994 17.7-99.0 21.0 21.9 24.6 25.8 25.7 25.9 24.6 23.8 22.4 20.1 23.0  24 
1995 19.0-99.0 20.9 23.3 25.9 25.6-99.0 25.8 25.0 23.2 21.3 19.0 22.9  17
1996 18.1 20.4 20.7 23.9 27.1 26.8 27.0 26.5 26.1 24.1 20.9 20.2 23.5  20
1997-99.0 20.3 22.4 23.8 25.3-99.0-99.0 26.3 25.6 24.0 21.9-99.0 23.7  20
1998 19.4 19.5 21.5 24.1 26.6 27.8 26.3 26.8 25.0 24.6 21.6 19.6 23.6  22
1999 17.9 20.0 21.7 24.3 25.5 25.7 25.3 25.6 24.4 22.5 19.6 17.5 22.5  24
2000 18.2 20.4 22.0 23.8 23.1 25.3 25.6 24.7 25.9 22.7 21.1 18.8 22.6  21
2001 17.6 19.8 19.8 22.7 24.8 25.0 25.4 26.5 24.4 23.0 21.5 18.5 22.4  23
2002 19.0 18.7 21.7 24.5 24.7 26.0 26.5 25.4 24.5 23.9 20.6 19.1 22.9  24
2003 18.6 20.3 21.7 23.6 26.3 26.8 25.3 24.5 24.1 23.7 22.6 18.8 23.0  22
2004 17.9 19.6 22.9 23.4 25.1 26.0 26.4 25.9 24.3 24.6 20.8 17.9 22.9  23
2005 19.8 18.5 20.4 23.4 25.0 26.2 26.3 26.2 25.4 22.8 20.8 18.6 22.8  33
2006 18.7 19.4 22.1 25.1 24.8 25.3 26.0 22.6 24.3 23.1 20.3 18.0 22.5  32
2007 16.5 19.0 21.4 23.3 24.3 25.2 24.4 24.9 24.7 22.6 20.0 18.6 22.1  33
2008 19.0 20.8 21.1 24.3 25.6 25.8 24.8 25.5 23.3 22.0 19.1 17.4 22.4  38
     16.5 17.7 20.1 22.6 24.5 25.7 25.5 25.3 24.4 22.3 19.3 17.0 21.7
     16.3 17.6 19.7 21.9 23.7 24.5 24.1 24.0 23.1 21.6 18.8 16.7 21.0
 
For Country Code 414
[chiefio@tubularbells analysis]$  

There is a rather dramatic drop out in 1991-93, that has a reprise in 1997, followed by a remarkably steady 22.x C series after that. Prior to that Mexican Revolution Part Deux, we have a cold start, a ramp to stability with more thermometers in about 1920, then a steady if slightly rolling series of 21.x 22.x 21.x 22.x C etc. with a slight upward tilt proportional to the thermometer drift south in those years.

Once again, not much consistent warming other than the thermometer movement.

In Conclusion

There is clear evidence of stability in Mexico when the instrumentation is held steady. There is also clear evidence that adding a lot of thermometers to a “megathermal” band gives you warmer and stable temperatures. Starting in about 1990 with the Mexican Thermometer Revolt…

We have learned to use a “climate zone” map to better understand why the thermometers are leaving one LAT LONG and going to another… (The Heat is not always Due South ;-) and we have seen, again, that the history of an area prior to achieving a large stable number of thermometers is not a good benchmark. For Mexico, dates prior to 1921 or so are useless as a benchmark period unless one wishes to accept a 2 C heating bias.

Finally, there is again evidence for a significant deliberate “fudge” of the thermometer locations in the 1990 (plus or minus a few years) time period. While Canada and the USA have there thermometers gutted, Mexico gets a significant gain in numbers. And in a part of Mexico that looks to be over represented anyway.

There can be no scientific rational for that behaviour. There can be a political one.

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About E.M.Smith

A technical managerial sort interested in things from Stonehenge to computer science. My present "hot buttons' are the mythology of Climate Change and ancient metrology; but things change...
This entry was posted in NCDC - GHCN Issues and tagged , . Bookmark the permalink.

4 Responses to GHCN – Mexico, A Megathermal Vacation Band

  1. Rick Beikoff says:

    With regard to getting your work “out there”, I occasionally correspond with a senior national print journalist here in Australia who also runs a blog and does TV commentary.

    I emailed him about your work with a link to your blog and he’s keen to run a story and push it. He works for a large international media group and thinks he can get your work international exposure. He’d like to get a layman’s summary from you, if possible.

    I don’t want to say anymore here, but if you could email me I’ll send you back our recent correspondence about your work. I couldn’t find your email address anywhere.

    REPLY: “Great! The email is in the ‘about’ tab up top in a form that the spam engines can not collect well. It’s Pub4all then an at sign, then AOL with the Dot Com after it. -ems”

  2. Bob D says:

    For those who are interested, here is a plot of the Mexico data. All years that have -99 in any month are excluded.

  3. Adam Gallon says:

    I’ve sent an e-mail to the BBC’s Panorama team, I shouldn’t think that they’ll want to investigate this little scam too deeply!

  4. Rick Beikoff says:

    Sorry, I’m not very computer savvy, but I think I’ve sent you an email. Please let me know if I haven’t!

    REPLY: “Assuming you meant me… I’ll check email some time tomorrow. This has been a marathon session to knock out so much so fast and I’m a bit fried. I still have a ‘stock market focus’ to do, probably tomorrow, as the market is looking interesting again (and that is how I make my lunch money ;-) So give it to about 5 pm PST before you worry that there was no reply. -ems “

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