Coolest July Ever

By Jason Meyers, Meteorologist

Coolest July on Record

June 18, 2010 Updated Aug 2, 2009 at 6:43 AM EDT

FORT WAYNE, Ind. (Indiana's NewsCenter) -- This July ranks as the coldest July on record in the Fort Wayne area. The average monthly temperature for July 2009 was 68.9 degrees. That's 4.5 degrees below normal. The previous record was 69.7 degrees set in 1967.

Why so cool?

A persistent trough of low pressure across Eastern Canada and the Eastern United States has helped to funnel cool Canadian air into the Great Lakes and Ohio Valley for most of the summer, while keeping the hot and humid weather well to our west. In addition to the cooler than normal air, below normal dew points have helped to make the summer feel more like Fall with very low but comfy relative humidities.

Lake effect... in July?!

It has been so cool that on two separate occasions, rare July lake effect rain showers occurred across southwest lower Michigan and northwest Indiana on July 1st and 2nd, and again on July 18th. On both occasions, high temperatures remained in the low 60's and low 70's.

Highs and Lows

The hottest day was on July 10th with a high of 87, and the coolest temperature was 49 just four days later on July 14th. The last time the highest temperature in July was just 87 was in 2000. All other July highest temperatures on record had high temperatures of at least 88 degrees. The average HIGH temperature was 79.2 degrees, which is the record coolest average high temperature for July. July 1915 was previously the coldest at 79.9 degrees. The average monthly low temperature was 58.5, and this ranked as the third coolest for average low temperatures.

Struggling to warm up.

Only three of the 31 days in July 2009 had an average temperature above normal. July 28th was the warmest day of the month with an average temperature of 75 degrees, just two degrees above normal. There was one day with the average temperature at least ten degrees below normal, and that was the coldest day of the month on July 4th. The high was only 72 and the low was 52, and average temperature of 62, eleven degrees below normal. Fort Wayne also broke records for the coolest high temperature on two separate days, July 17th and 22nd.

Rainy July cools us down.

Cold Canadian Air coupled with above normal cloud cover were the main reasons for keeping temperatures well below normal. Precipitation for the month actually ended up being above normal after a slow start in the beginning of July. The Fort Wayne airport recorded 4.22" of rain, .64" above normal.

A cool Summer.

So far, this summer has had well below normal average temperatures. Fourteen of 30 days in June had an average temperature at or below normal while July saw an impressive 28 out of 31 days with average temperatures at or below normal.

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