A Lack Of Heat In Summer, August 2015

Meteorological summer 2015 has come to an end, and it was 34th coolest, 112th warmest, and 17th wettest on record in Cincinnati. This summer finished 3.78″ below average for rainfall and about 0.74° below average for temperature. Based on the departure from average, this summer was actually cooler than summer 2013 and summer 2014 combined. Based on average temperature, this summer was the coolest in Cincinnati since 2009:

sep1-avgtemp

The average summer temperature for 2015 would be higher had it not even for a cooler than average July and August. July and August finished 0.49° and 2.59° below average, respectively. This may not seem like a lot, but remember the the average temperature is the average of the daily high and daily low averaged over the entire summer.

On average, there are 7 days each in both July and August with a high temperature of or above 90° in Cincinnati. So far this year, there have only been 9 90°+ days in the Queen City (5 in June and 4 in July):

sep1-90days

Cincinnati averages 21 days each year with a high temperature of or above 90°. The likelihood of hitting 90° drops very quickly late in September and is extremely low in October. Cincinnati will likely hit 90° at least once in the week ahead before cooler air returns.

It is unusual to not hit 90° at least once during August in Cincinnati. Even during a much cooler summer (2009), Cincinnati still managed to hit 90° once:

sep1-90augustdays

Since official records for Cincinnati began on November 1, 1870, there have only been 8 Augusts where the temperature failed to reach 90° at any point during the month:

sep1-no90saugustyears

I hope you enjoyed the break in heat during August. High temperatures will consistently be in the upper 80s to around 90° through early next week. Cooler air will return to the Tri-State by mid-September.

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