Urban Heat Island

NoTricksZone
"Most of the surface temperature data that goes into the averages, whether world-wide, or here in the U. S., come from airports. In the U. S., the number is 121 out of 134 stations. "
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ED: ...and here's more

Airports A Tarmac Tale (E.M.Smith) 18 Nov. '10

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The Rewritten Past (E.M.Smith) 13 Dec. '10

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UAH and UHI (WUWT) 16th Dec '10
"Note: clearly satellites can see urban heat, as demonstrated by this recent paper unveiled at the 2010 AGU meeting by NASA. See: Satellites Image the Urban Heat Islands in the Northeast. It can also be demonstrated that the UHI biases the thermometers upwards. As cities grow, so does the increased bias."
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3% of Earth’s landmass is now urbanized (WUWT) 23rd Dec '10
"This study, from 2005, is not one I’ve covered here before, but I thought it was relevant to have a look at as a logical followup to the recent announcement from NASA at AGU that satellites have identified strong UHI signatures in cities. The vast majority of the world’s surface weather stations used to monitor climate are in urban areas, many in the GHCN for example are at urban airports. "