High temperatures on Sunday once again struggled in the 70s, which is a very pleasant treat for July in Iowa. This July has seen plenty of cool days which adds up to one of the coolest July's on record as highlighted by the featured chart. The average temperature (mean of daily high and low) for the month is shown along with the coolness rank over the number of available years. This unofficial ranking has the Quad Cities and Davenport on its way to the coldest July on record. It is interesting to see how much different Des Moines appears on this chart. Outside of a sensor calibration issue, the first obvious explanation is the Urban Heat Island affect that is most pronounced for that site in Iowa.

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Tags:   jul14