The record heat shouldn't be a surprise: Six of the eight hottest summers in Phoenix have happened since 2000.Remember that blistering week in June, from the 19th through the 25th?A bolt cuts through the clouds over the northwest part of town, one of numerous lightning strikes from monsoon storm cells blowing up around the city but leaving no rain, Saturday, July 8, 2017 in Tucson. For example, in 2008, Phoenix reached a record low 64 degrees for Aug. In the same span, it has set 252 daily record highs.
This year, the city's overnight lows in June, July and August fell below 75 degrees only six times.Between 19, Phoenix averaged five 100-degree days each May. It has also reached 100 degrees in April 53 times in the city's history, with more than half of them since 1989.And Phoenix hit 100 degrees once in March in 1988, the only time it has done so to this point. September has averaged 18 100-degree days since 1990. Phoenix has hit triple digits in October 49 times in its history.Light strikes over the the Tanque Verde wash, partially filled with standing water from runoff on Tanque Verde Loop Rd., from the tail end of a monsoon storm, Friday, July 28, 2017 in Tucson, Arizona.Extensive damage was done to the Desert Canyon Golf Course clubhouse in Fountain Hills during an intense storm Sunday night, July 16, 2017.At the other extreme, Phoenix had seven nights this summer where the temperature never fell below 90 degrees.