Exposed 30/7/2012
This will trigger some “scientific” bum-clenching:
PRESS RELEASE – U.S. Temperature trends show a spurious doubling due to NOAA station siting problems and post measurement adjustments.
Chico, CA July 29th, 2012 – 12 PM PDT – FOR IMMEDIATE RELEASE
A comparison and summary of trends is shown from the paper. Acceptably placed thermometers away from common urban influences read much cooler nationwide:
This blog has said it all along: Airports, where the majority of official temperature recordings are made, are warmer places than the natural terrain.

Hmm. You’ve left out some fairly important disclaimers, being that this paper is unpublished – it hasn’t even been SUBMITTED for publication, and it’s from the incredibly skeptical thinktank WUWT, which has been saying the same thing for years no matter what anyone else is able to demonstrate.
In other words … no real news.
Hmmm, Matthew I don’t see anyone attempting to refute this
“The USHCN is one of the main metrics used to gauge the temperature changes in the United States. The first wide scale effort to address siting issues, Watts, (2009), a collated photographic survey, showed that approximately 90% of USHCN stations were compromised by encroachment of urbanity in the form of heat sinks and sources, such as concrete, asphalt, air conditioning system heat exchangers, roadways, airport tarmac, and other issues. This finding was backed up by an August 2011 U.S. General Accounting Office investigation and report titled: Climate Monitoring: NOAA Can Improve Management of the U.S. Historical Climatology Network.”