While not an official weather metric that the National Weather Service tracks, the IEM maintains a database of hourly airport weather observations. The featured chart shows the warmest hourly observations from the Des Moines airport during the month of August. The extremely warm and muggy overnight on Wednesday set a new August record of 83 degrees at 7 AM and tied at the same value at 8 AM. Such hot and steamy conditions overnight are very dangerous as un-airconditioned buildings and livestock will struggle to cool off to recover from the day time heat. Conditions will be cooler on Thursday with over night temperatures back to comfortable levels, which again helps to make things a bit more bearable.

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