The official low temperature for Des Moines has yet to breach 60°F since the first of July. The featured chart presents accumulated frequencies of having the first fall season (after 1 July) temperature below the given threshold by the given date of the year. For August 12th and 60 degrees, the frequency is about 80%, so about four out of every five years have seen such a cool temperature by the current date. The chart also shows three other thresholds for comparison. Frequencies of the first sub 50 really start to increase by the end of next week, but the 50 percent value does not come until September. The urban heat island of Des Moines certainly helps to buoy overnight temperatures as sub-60 values will be common this week outside of city including those this Wednesday morning.

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