Publication Date August 11, 2016

Warm Nights Tip the Scales as Summer Grinds On

United States
The average daily minimum temperature for the contiguous U.S. is at record-warm values for the summer of 2016 thus far (June plus July). Image: NOAA/NCEI

It’s the muggy nights that are imprinting themselves on the psyche of millions of Americans this summer. The average daily minimum for the contiguous U.S. was the warmest on record for June and July combined: 60.57°F, beating out 2015, 2010, 2002, and 2006. Warmer nights are a hallmark of a climate being heated by added greenhouse gases, and it’s long been recognized that nights should generally warm more than days, and winters more than summers, as climate change proceeds. Of the eight June-July periods with the warmest average daily temperatures (including both highs and lows), four are from Dust Bowl years. However, the eight years with the warmest average daily minimum temperatures are all from the 21st century. Urban heat islands are no doubt helping to increase overnight lows in large metropolitan areas; however, the nationwide extent of the trend toward warm nights goes well beyond this effect