The weather over the past few days has been near perfection with warm temperatures, low humidities, and a light breeze. One of the measures of humidity is relative humidity (RH). The RH percentage is somewhat difficult to directly interpret as it does not account for temperature. That aside, the featured chart looks at daily climatology of RH based on period of record data for Des Moines. The red line represents the daily frequency of having the minimum RH below 40%, like it was on Wednesday. This line depicts a clear seasonal cycle with frequencies peaking during mid Spring and mid Fall. This is one of the reasons folks tend to like these two times of year as temperatures are generally warm and humidities are lower like it currently is.

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