Perspective On 90°+ Heat In September 2015

Today marks the 7th straight day in Cincinnati where the temperature hit or went above 90°. It is not unusual for the temperature to reach 90° during September in Cincinnati, but a week-long stretch of 90°+ heat is uncommon.

Including today, the high temperature in Cincinnati has hit 90° 7 times this month (September 2nd through September 8th). This is the most number of 90°+ days during September in the Queen City since 2010:

sep8-blog-90degreeseptdays

On average, the warmest high temperature of September in Cincinnati is 90°. However, Cincinnati has only hit 90° 51 out of the last 145 years (about 35%). In the last 9 years, the Queen City has failed to hit 90° during September twice:

sep8-blog-warmestsepttemp

Our recent stretch of 90°+ days during September is not a record. In fact, we had 7 consecutive days of 90°+ during September 2007. 10 of the 11 90°+ days in 1897 came in a row:

sep8-blog-90streaks

During the warmest September on record (with an average temperature of 76.37°, about 9.5° above the 1981-2010 average), Cincinnati hit 90° 7 times. While the stretch of 90s in early September brought the average up, high temperatures consistently in the 80s and low temperatures in the upper 60s and lower 70s made September 1881 the warmest.

Through the 8th, September 2015 is off to the 19th warmest start on record. The week ahead looks much cooler with highs in the 80s and 70s.

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