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The 2006 average annual temperature for the contiguous U.S. was the warmest on record and nearly identical to the record set in 1998. Based on preliminary data, the 2006 annual average temperature was 55°F, 2.2°F (1.2°C) above the 20th Century mean and 0.07°F (0.04°C) warmer than 1998.
National Climatic Data Center http://www.ncdc.noaa.gov/oa/climate/research/2006/ann/us-summary.html
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