"...
Steve McIntyre posted this data from NASA's newly published data set from Goddard Institute of Space Studies (GISS) These numbers represent deviation from the mean temperature calculated from temperature measurement stations throughout the USA.

According to the new data published by NASA, 1998 is no longer the hottest year ever. 1934 is.

Four of the top 10 years of US CONUS high temperature deviations are now from the 1930s: 1934, 1931, 1938 and 1939, while only 3 of the top 10 are from the last 10 years (1998, 2006, 1999). Several years (2000, 2002, 2003, 2004) fell well down the leaderboard, behind even 1900. (World rankings of temperature are calculated separately.) "
http://www.norcalblogs.com/watts/2007/08/1998_no_longer_the_hottest_yea.html
{linked from http://www.junkscience.com/}

Also same site [Watts Up]:
"I salute the work of Steven McIntyre, he has now made two major contributions to climate science.
1) Proving how the Mann "hockey stick" used in all Gore's movie, An Inconvenient Truth, was based on unsupportable data and methods.
2) Proving how yearly temperature anomalies for the USA are based on data that had been processed incorrectly.