Airports Atlanta and Chicago MIdway vs Wunderground Nearby List

So we looked at Salt Lake City, Utah and Reno, Nevada in the just made prior posting here:

https://chiefio.wordpress.com/2012/07/26/salt-lake-city-airport/

Where we found a general upward trend to a trend line plotted through a scatter plot of ‘nearby’ stations listed in the order of presentation on Wunderground. We also found a very significant increase in the Airport temperature when compared to the average of ‘nearby’ stations (tossing out the highest and lowest as potential ‘outliers’).

I then went looking for a 3 rd station and ran smack into Atlanta, Georgia that had 2 identical highs and 2 identical lows ‘nearby’ (so do I toss out one of each, both of each, or none?…) and had a flatter trend line (but the Airport temperature still above the average). OK, I can now either ‘cherry pick’ number three, present Atlanta as #3, or add another item #4 as a continuation and see if Atlanta is less like the pattern or if the next one matches it or matches the prior two… So I’m doing two in this posting. Turns out the fourth one tried (Chicago) is very much like Salt Lake City and Reno Nevada… So at this point we have 2 patterns: Rising temperatures as stations are higher in the list and nearly flat trend line with list position; but in both cases with the Airport above the average.

In this comparison I also wanted to answer the question of “How much does tossing outliers matter?” so there are 4 graphs total. With and without the outliers. For Atlanta I toss all 4 or keep all 4 as I have no reason to pick one of the two identical temperatures over the other. For the ones with the data removed, I left the position in place, but blank, so the length of the graph does not change making visual comparisons easier.

With that, here are the graphs, the average and delta to average temperatures, and the data sets I snagged.

Chicago Midway

I chose Midway as the airport is closer to town. ORD was an Orchard (thus the symbol ORD) and it’s a long taxi ride to town…

Chicago Midway vs Wunder-nearby all data 25 July 2012

Chicago Midway vs Wunder-nearby all data 25 July 2012

And with the highest and lowest removed from the series:

Chicago Midway minus H & L outliers vs Wunder-nearby list 25 July 2012

Chicago Midway minus H & L outliers vs Wunder-nearby list 25 July 2012

For Chicago the airport temperature is 75 F 73.77 1.23 0.68
While the mean is 73.77 and 71.50 F for the all data and the H/L left out versions. The “differences” are 1.23 F and 0.68 C for the first (all data) case. 3.50 F and 1.95 C in the second (high / low left out) case.

Altlanta

In some ways much more interesting. What makes Atlanta different from the others? Location of the airport? Particulars of the relative stations? Local topography? At any rate, here are the graphs:

All data:

Atlanta Ga KATL  vs Wunder-nearby all data 25 July 2012

Atlanta Ga KATL vs Wunder-nearby all data 25 July 2012

For Atlanta the airport temperature is listed as 78 F.

While the mean is 76.35 and 76.33 F for the all data and the H/L left out versions. The “differences” are 1.65 F and 0.92 C for the first case. 1.67 F and 0.93 C in the second.

And with the Highest and Lowest removed:

Atlanta Ga KATL -HL 25 July 2012 vs Wunder-nearby stations

Atlanta Ga KATL -HL 25 July 2012 vs Wunder-nearby stations

In Conclusion

It looks to me like tossing the high and low has a minor impact, but doesn’t change the conclusion in any significant way. It also looks like though Atlanta has a different distribution of stations down the list (in terms of temperature trend) the station at the airport is clearly still reading above the average.

Now I’ve taken a load of rocks tossed at me by Warmistas over my complaints about averaging temperatures. They repeatedly trot out the same old argument that averaging enough temperatures will fix the errors. OK then: That same argument says that the thermometers at Airports are WRONG and do not represent the average of the areas nearby and regularly report high values. I now respectfully request that all airport data be purged from any data set used for making policy recommendations or for use to show the presence of a “Global Warming Trend”. The averages show they are outliers. But a lot.

The Data

Here are the data grabs for these two stations, perhaps folks more familiar with the area can make more sense of the patterns.

Chicago

Chicago Weather at a Glance 
Weather Station
Chicago Midway (KMDW)
Elevation
620 ft 
Station Select
Now

Partly Cloudy
Temperature
75 °F 
Feels Like 75 °F 
Wind(mph)
7
Sunrise / Set
5:37 AM
8:15 PM

Weather Stations Station Location	Temp.	Heat Index	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
Chicago, IL	74.3 °F	76 °F 	65 °F 	73%	SE  at  4.0 mph 	0.00 in / hr	0 ft	43 sec ago	Rapid Fire	 
River North, Chicago, IL	74.8 °F 	76 °F 	65 °F 	72%	North  at  2.0 mph 	0.00 in / hr	623 ft	26 sec ago	Rapid Fire	 
U.S. Cellular Field, Chicago, IL	75.1 °F 	77 °F 	63 °F 	66%	 South   at  1.0 mph 	0.00 in / hr	590 ft	8 min 40 sec ago	Normal	
Bucktown, Chicago, IL	74.0 °F 	76 °F 	64 °F 	70%	 North   at  0.0 mph 	0.00 in / hr	600 ft	0 sec ago	Rapid Fire	 
DePaul Geography, Chicago, IL	75.6 °F 	77 °F 	65 °F 	69%	 North   at  0.0 mph 	0.00 in / hr	650 ft	3 min 57 sec ago	Rapid Fire	
South Lakeview, Chicago, IL	75.1 °F 	77 °F 	62 °F 	62%	 SSE   at  0.0 mph 	0.00 in / hr	607 ft	0 sec ago	Rapid Fire	 
West Lakeview, Chicago, IL	74.9 °F 	77 °F 	64 °F 	69%	 SSE   at  2.0 mph 	0.00 in / hr	636 ft	11 min 20 sec ago	Normal	
Lakeview East, Chicago, IL	75.6 °F 	77 °F 	66 °F 	69%	 ENE   at  6.9 mph 	0.00 in / hr	630 ft	5 sec ago	Rapid Fire	
Irving Park, Chicago, IL	74.5 °F 	76 °F 	66 °F 	74%	ESE  at  4.0 mph 	0.00 in / hr	600 ft	1 sec ago	Rapid Fire	 
North Park University, Chicago, IL	74.3 °F 	75 °F 	66 °F 	75%	 SSE   at  3.0 mph 	0.00 in / hr	617 ft	12 min 48 sec ago	Normal	
Oak Park, IL, Oak Park, IL	73.2 °F 	74 °F 	66 °F 	78%	South  at  2.0 mph 	0.00 in / hr	617 ft	8 sec ago	Rapid Fire	
APRSWXNET Berwyn IL , Berwyn, IL	74 °F 	75 °F 	67 °F 	79%	 South   at  1 mph 	0.00 in / hr	620 ft	25 min 53 sec ago	MADIS	
Peterson Woods, Chicago, IL	73.6 °F 	74 °F 	66 °F 	78%	 SSW   at  0.2 mph 	0.00 in / hr	614 ft	3 min 22 sec ago	Normal	 
Midway Airport SE corner runway 13C 12/0, Chicago, IL	72.3 °F 	75 °F 	61 °F 	67%	 South   at  4.0 mph 	0.00 in / hr	620 ft	1 min 33 sec ago	Normal	
West Rogers Park, Chicago, IL	75.7 °F	77 °F 	64 °F 	68%	 North   at  0.0 mph 	0.00 in / hr	595 ft	1 sec ago	Rapid Fire	
Garfield Ridge, Chicago, IL	73.6 °F 	76 °F 	63 °F 	70%	NE  at  3.1 mph 	0.00 in / hr	604 ft	4 sec ago	Rapid Fire	 
Historic East Side, Harwood Heights, IL	73.5 °F 	75 °F 	65 °F 	73%	South  at  1.0 mph 	0.00 in / hr	635 ft	1 min 47 sec ago	Normal	
Lincolnwood, Lincolnwood, IL	73.8 °F 	75 °F 	64 °F 	72%	 SSE   at  3.0 mph 	0.00 in / hr	0 ft	4 min 45 sec ago	Normal	 
Evanston KU9Z.Net, Evanston, IL	73.8 °F 	75 °F 	65 °F 	74%	 WSW   at  0.0 mph 	0.00 in / hr	600 ft	9 sec ago	Rapid Fire	
Lyons Police Department, Lyons, IL	74.0 °F 	75 °F 	66 °F 	75%	 North   at  1.0 mph 	0.00 in / hr	615 ft	2 sec ago	Rapid Fire	
South Evanston, Evanston, IL	73.3 °F	74 °F 	67 °F 	80%	 South   at  0.0 mph 	0.00 in / hr	640 ft	35 sec ago	Normal	 
KC9HZC, Brookfield, IL	71.1 °F 	-	69 °F 	92%	 NE   at  0.0 mph 	0.00 in / hr	617 ft	40 sec ago	Rapid Fire	 
Irving Park Rd & Pacific Ave, Chicago, IL	73.0 °F	73 °F 	66 °F 	80%	 ESE   at  0.0 mph 	0.00 in / hr	635 ft	7 sec ago	Rapid Fire	
Lyons Illinois Weather, Lyons, IL	73.1 °F 	74 °F 	65 °F 	76%	 ESE   at  0.0 mph 	0.00 in / hr	620 ft	2 min 45 sec ago	Normal	 
MARITIME , Chicago, IL	74 °F 	72 °F 	 - 	-	 SSE   at  16 mph 	0.00 in / hr	577 ft	42 min 53 sec ago	MADIS	
Brookfield, IL	73.1 °F 	74 °F 	66 °F 	78%	 SSE   at  1.0 mph 	0.00 in / hr	659 ft	14 min 35 sec ago	Normal	
APRSWXNET Norridge IL , Chicago, IL	73 °F 	74 °F 	66 °F 	78%	 East   at  0 mph 	0.00 in / hr	656 ft	1 hr 5 min 53 sec ago	MADIS	
APRSWXNET Oak Lawn IL, Hometown, IL	72 °F 	73 °F 	65 °F 	79%	 North   at  0 mph 	0.00 in / hr	620 ft	22 min 53 sec ago	MADIS	
Mr. Hammes's Weather, Westchester, IL	70.9 °F 	74 °F 	61 °F 	71%	 ESE   at  0.0 mph 	0.00 in / hr	641 ft	2 sec ago	Rapid Fire	 
Norwood Park Township, IL	73.8 °F	74 °F 	68 °F 	81%	South  at  3.8 mph 	0.00 in / hr	646 ft	1 sec ago	Rapid Fire	 
Gladstone Park Area, Westchester, IL	72.5 °F 	73 °F 	65 °F 	78%	 SSE   at  1.0 mph 	0.00 in / hr	640 ft	4 min 29 sec ago	Normal	 
KA9UMG 91th and Mobile, Oak Lawn, IL	74.0 °F 	76 °F 	64 °F 	70%	SSE  at  2.1 mph 	0.00 in / hr	627 ft	3 sec ago	Rapid Fire	

Atlanta


Atlanta, GA
5:23 AM EDT on July 25, 2012 (GMT -0400)
Elev: 876 ft 
Lon: 84.4° W
Lat: 33.9° NSource		Rapid Fire Updates™		Updated 32 min 46 sec ago 	Get Free Weather Stickers®	Share:				 	

Tropical Weather: Invest 98l  (North Atlantic) Invest 90e  (East Pacific) 
 
 
 View WunderPhotos® in: Atlanta, Georgia 
 
 
 Visit Our Video Section 
 
 Weather Summary 

Jessica Parker
Weather Underground Forecast for Wednesday, July 25, 2012. 

 A low pressure system over the Northern Plains is expected to move eastward 
Wednesday and Thursday and become the main weather producer for the nation. 
Showers and thunderstorms will continue from the Northern and Central Plains 
to the Great Lakes and Ohio Valley. In particular, a slight risk of severe 
thunderstorms is expected from the Upper Mississippi and Mid-Missouri valleys 
across the Great Lakes, with the main threat of hail and damaging winds. 

 Apart from this system, a frontal boundary will remain over the Mid-Atlantic 
and parts of the Tennessee Valley and Southeast. Showers and thunderstorms are 
anticipated with this system. 

 Elsewhere, unsettled weather will persist over portions of the Gulf States. 
Expect showers and thunderstorms to become more widespread in the afternoon 
and evening especially over the coastal region. In addition, monsoonal flow 
will keep scattered showers and thunderstorms going over the Four Corners region. 
Farther north, a weak front in the northern Intermountain West may trigger a few 
showers and thunderstorms. 

 Another hot day is in store for portions of the Central Plains, Mississippi 
Valley and Ohio Valley Wednesday and Thursday. Afternoon temperatures are expected 
in the 100s with possible heat indicies 105 to 110. Moreover, minimum nighttime 
temperatures will only fall into the mid-70s. 
Continue Reading…

Weather Underground Broadcast Network
 Atlanta Weather at a Glance 
Weather Station
Atlanta (KATL)
Elevation
1024 ft 
Station Select
Now

Clear
Temperature
78 °F 
Feels Like 78 °F 
Wind(mph)
6
Sunrise / Set
6:44 AM
8:43 PM

Weather Stations Station Location	Temp.	Heat Index	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
Buckhead, Atlanta, GA	76.1 °F 	77 °F 	72 °F 	81%	 WSW   at  1.0 mph 	0.00 in / hr	1042 ft	4 sec ago	Rapid Fire	 
Buckhead: The Wakefield, Atlanta, GA	76.8 °F 	78 °F 	73 °F 	87%	 ENE   at  0.0 mph 	0.00 in / hr	1240 ft	24 min 29 sec ago	Normal	 
Sandy Springs, Atlanta, GA	74.7 °F 	73 °F 	72 °F 	92%	 North   at  0.0 mph 	0.00 in / hr	1020 ft	9 min 48 sec ago	Normal	 
Midtown/Buckhead, Atlanta, GA	75.3 °F 	74 °F 	72 °F 	91%	 NW   at  0.0 mph 	0.00 in / hr	918 ft	4 sec ago	Rapid Fire	 
Marist School, Atlanta, GA	74.1 °F 	77 °F 	59 °F 	59%	 NW   at  0.0 mph 	0.00 in / hr	880 ft	10 min 35 sec ago	Normal	
Georgia Tech (Midtown), Atlanta, GA	78.6 °F 	81 °F 	70 °F 	75%	 SW   at  0.0 mph 	0.00 in / hr	1050 ft	1 sec ago	Rapid Fire	 
Smynings, Smyrna, GA	77.4 °F 	79 °F 	71 °F 	82%	 NW   at  0.7 mph 	0.00 in / hr	1076 ft	0 sec ago	Rapid Fire	 
Druid Hills, Atlanta, GA	78.3 °F 	81 °F 	72 °F 	80%	 WNW   at  0.0 mph 	0.00 in / hr	1022 ft	6 min 1 sec ago	Normal	 
Lakeside, Atlanta, GA	77.5 °F 	79 °F 	72 °F 	83%	 North   at  0.0 mph 	0.00 in / hr	971 ft	4 min 45 sec ago	Normal	 
Murphey Candler, Atlanta, GA	75.9 °F 	77 °F 	69 °F 	79%	 North   at  0.0 mph 	0.00 in / hr	930 ft	1 sec ago	Rapid Fire	 
Chattahoochee Plantation, Marietta, GA	74.0 °F 	72 °F 	74 °F 	93%	 WNW   at  0.0 mph 	0.00 in / hr	1018 ft	1 sec ago	Rapid Fire	 
Williams Park, Smyrna, GA	76.9 °F 	78 °F 	71 °F 	82%	 WNW   at  0.0 mph 	0.00 in / hr	1099 ft	31 sec ago	Normal	 
Clairemont-Great Lakes, Decatur, GA	76.3 °F 	77 °F 	70 °F 	81%	 SE   at  0.0 mph 	0.00 in / hr	0 ft	1 sec ago	Rapid Fire	 
PepperMill, Marietta, GA	73.6 °F 	70 °F 	72 °F 	95%	 South   at  0.0 mph 	0.00 in / hr	978 ft	9 min 57 sec ago	Normal	 
Wyntercreek/Meadowcreek, Dunwoody, GA	75.0 °F 	77 °F 	63 °F 	67%	WNW  at  0.0 mph 	0.00 in / hr	1072 ft	10 sec ago	Rapid Fire	
Meadowcreek Estates, Dunwoody, GA	75.6 °F 	76 °F 	69 °F 	80%	 WNW   at  0.0 mph 	0.00 in / hr	1072 ft	9 sec ago	Rapid Fire	 
Glenwood Estates, Decatur, GA	75.2 °F 	74 °F 	72 °F 	91%	East  at  0.0 mph 	0.00 in / hr	1016 ft	6 sec ago	Rapid Fire	 
Kirkwood, Atlanta, GA	75.9 °F 	76 °F 	72 °F 	88%	 North   at  0.0 mph 	0.00 in / hr	1050 ft	4 min 25 sec ago	Normal	 
Storybook Estates, Decatur, GA	73.9 °F 	75 °F 	67 °F 	78%	 NE   at  0.0 mph 	0.00 in / hr	0 ft	1 sec ago	Rapid Fire	 
Grant Park, Atlanta, GA	79.3 °F 	82 °F 	70 °F 	74%	 NE   at  0.0 mph 	0.00 in / hr	1050 ft	4 min 34 sec ago	Normal	 
Lake Colony, Marietta, GA	76.8 °F 	78 °F 	57 °F 	49%	 WNW   at  0.0 mph 	0.00 in / hr	1023 ft	2 sec ago	Rapid Fire	 
Rose Arbor, Atlanta, GA	79.3 °F	83 °F 	73 °F 	80%	 NW   at  0.0 mph 	0.00 in / hr	980 ft	41 sec ago	Normal	
East Atlanta Village, Atlanta, GA	76.1 °F 	77 °F 	72 °F 	87%	 North   at  0.0 mph 	0.00 in / hr	1020 ft	5 sec ago	Rapid Fire	 
City of Avondale Estates, Avondale Estates, GA	78.8 °F 	83 °F 	78 °F 	98%	 WNW   at  1.6 mph 	 - / hr	1079 ft	2 min 35 sec ago	Normal	 
Providence Place, Marietta, GA	73.6 °F 	74 °F 	67 °F 	81%	 NW   at  0.0 mph 	0.00 in / hr	1072 ft	0 sec ago	Rapid Fire	
Avondale Estates, Avondale Estates, GA	77.2 °F 	79 °F 	70 °F 	79%	 NW   at  0.6 mph 	0.00 in / hr	1027 ft	2 sec ago	Rapid Fire	 
Oak Creek, Avondale Estates, GA	76.0 °F 	77 °F 	71 °F 	85%	 West   at  0.0 mph 	0.00 in / hr	975 ft	4 min 29 sec ago	Normal	
Ladywiz, Mableton, GA	76.4 °F 	77 °F 	72 °F 	87%	 North   at  1.0 mph 	0.00 in / hr	1000 ft	1 hr 32 min 1 sec ago	Normal	 
Fair Oaks, Marietta, GA	76.3 °F 	78 °F 	68 °F 	76%	 West   at  0.0 mph 	0.00 in / hr	1096 ft	3 sec ago	Rapid Fire	 
Eagle Ridge, Marietta, GA	77.7 °F	80 °F 	72 °F 	82%	 NNW   at  1.0 mph 	0.00 in / hr	1170 ft	2 sec ago	Rapid Fire	
Blackjack Mtn, Marietta, GA	76.5 °F 	78 °F 	71 °F 	84%	 WNW   at  2.0 mph 	0.00 in / hr	1299 ft	44 sec ago	Rapid Fire	 

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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...
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3 Responses to Airports Atlanta and Chicago MIdway vs Wunderground Nearby List

  1. p.g.sharrow says:

    Kind of hard to believe that after all these years somebody checked nearby thermometers against airport thermometers. As a former light aircraft pilot I knew that there was an updraft over the airfield pavement that wasn’t there over grass fields. All of that pavement is energy conductive and a much higher energy storage mass then soil. Much of the surface materials research that I have seen only deals with reflectivity and surface absorption of energy, nothing on conduction and storage of heat energy. This certainly demonstrates that airport thermometers are a poor substitute for open field stations. Large paved airfields have a heat bubble or bulge over them, similar to the one over cities. Man made global warming,……….. pavement. pg

  2. Pingback: More Airports Hotter Than ‘nearby’ Stations | Musings from the Chiefio

  3. E.M.Smith says:

    @P.G.Sharrow:

    Having flown in hot air balloons and taken glider lessons, I’m pretty sensitive to the “lift” you get near tarmac and runways… It can be dramatic in a glider.

    At any rate, this little “trick” with Wunderground lets anyone do a ‘sanity check’ on nearby stations… at least until Wunderground pulls the station list under pressure from warmers ;-)

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