20 Jun 2014:
Summer Temperatures in U.S.
Have Risen Up To 5 Degrees Since 1970
Summer temperatures in the U.S. have been rising on average 0.4 degrees F per decade since 1970, or about 2 degrees F overall, but the Southwest and West regions have borne the brunt of those increases, according to an analysis by Climate Central
. In the Southwest, temperatures have risen an average of 0.6 degrees per decade, with a few localized areas warming as much as 0.9 degrees per decade. In the West, some parts of California and Nevada have warmed 1.32 degrees F per decade, or more than 5 degrees total since 1970. On the other end of the spectrum, the Upper Midwest has seen the lowest increases. Temperatures in that region have increased only 0.1 degree F per decade on average. The National Climate Assessment
, released last month, found that annual average temperatures in the U.S. could increase by 10 degrees F before the end of the century if the rate of greenhouse gas emissions doesn't slow.
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