just do it - 6/25/2012 18:47
Anyone ever think that 50 to 100 years ago the temp recording sites were outside the city limits. Now most the sites are in the same place but the city has grown around them. It's warmer in the city than in the country. DUH
You're just scratching the surface...
http://www.surfacestations.org/
These guys set out to evaluate all of the stations to see if they still meet specs. Some good pictures of stations right above AC units. | 
Global warming.
