It was ugly hot in Iowa on Tuesday with heat index values well above 100 degrees thanks to air temperatures well into the 90s and dew points in the 70s. The month of August is still squarely within the summer months for Iowa, so such weather is not a surprise. The featured chart looks into the date of the year for Des Moines with the highest dew point temperature. The value for 2022 was set at 77 degrees back on 13 June, so that was not quite exceeded Tuesday evening. The bottom left panel shows a fare amount of spread for when the peak dew point temperature occurs, but it is generally found during the peak crop transpiration time in July and early August.

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