The muggiest air of the year so far arrived in Iowa on Tuesday with dew points well into the 60s. The featured chart displays the average dew point values for each May for Des Moines. This May so far is well below average and one of the driest values on record. There is still a week of May to go and this average value will creep upwards with the actual dew point values approaching 70 degrees later this week.

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Tags:   dewpoint