US Temperatures - 1895-2012

Annual surface temperatures for the contiguous U.S. compared to the 20th Century (1901-2000) average. Calculated from the U.S. Historical Climatology Network (USHCN version 2). More information: U.S. Surface Temperature Data, USHCN v2.
Surface temperatures averaged across the U.S. have also risen. While the U.S. temperature makes up only part of the global temperature, the rise over a large area is not inconsistent with expectations in a warming planet. Because the U.S. is just a fraction of the planet, it is subject to more year-to-year variability than the planet as a whole. This is evident in the U.S. temperature trace.
Source: NOAA
URL:     http://www.ncdc.noaa.gov/indicators/
(The text for the image(s) on this Web page was taken from the above source.)