National Overview - August 2013
Summer 2012 vs. Summer 2013

« National Overview - August 2013


Summer 2012 vs. Summer 2013

The weather and climate conditions during the summer of 2013 were in contrast to the conditions during summer 2012, resulting in different seasonal outcomes across the nation. The summer of 2012 was the second warmest summer on record for the contiguous U.S. with a temperature of 73.7°F. The 2013 summer average temperature of 72.6°F ranked as the 15th warmest summer. During summer 2013, temperatures were significantly cooler across many areas of the contiguous U.S. east of the Rockies. Average daily maximum temperatures for the 2013 summer period were as much as 7°F cooler than they were during summer 2012. While in some locations west of the Rockies, the summer of 2013 was warmer than the summer of 2012.

In terms of precipitation, the summer of 2013 was much wetter for many locations compared to the summer of 2012. Most of the Great Plains, Midwest, and East Coast received more rain during summer 2013. However, some locations along the Gulf Coast were drier during summer 2013. That is partially due to the lack of tropical cyclones impacting the region during 2013.

The maps below show on a climate division level the differences in temperature and precipitation totals between the summer of 2013 and the summer of 2012. On graphics A through C, blue areas indicate where temperatures were cooler during June-August of 2013 compared to the same period in 2012. Red indicates where temperatures were warmer. On graphic D, areas in green received more precipitation during the summer of 2013 compared to the summer of 2012 and brown areas received less precipitation in 2013. In all graphics, white indicates conditions during summer 2013 were similar to the summer of 2012.

A Summer 2012 vs. Summer 2013 B Summer 2012 vs. Summer 2013
C Summer 2012 vs. Summer 2013 D Summer 2012 vs. Summer 2013

The number of stations across the country experiencing at least one 100°F day was also much smaller during the summer of 2013 compared to 2012. According to preliminary analysis, about 1,670 stations had at least one 100°F day during 2013. During the same period in 2012 that number was around 4,410. Over the course of summer 2013, about 57.7 million people were affected by 10 or more 100°F days compared to 99.1 million people during summer 2012.


Summer 2012 vs. Summer 2013