Very muggy air visited the state on Thursday again with dew points approaching 80 degrees in some locations. Thankfully, such extreme dew point readings are not the norm for Iowa. The featured chart presents the frequency of hourly dew point temperature observations partitioned by week of the year for Des Moines. Only a few small slivers of red appear for the top most category at or above 78 degrees. For this chart, a one percent frequency would imply one hour per 100 hours or one hour every five days. A frontal passage Thursday evening removed the very muggy air from the state, so conditions will be much more comfortable on Friday.

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Tags:   dewpoint