On Thursday, the temperature at 6 AM was a balmy 31 degrees for Des Moines but then dropped to 18 at noon. The featured chart looks at how common it is for the noon temperature to be colder than the 6 AM temperature for each day of the year. This situation is certainly the most common during the winter months when air masses dominate our temperatures and the sun is the least effective at warming during the daytime. The bottom chart presents the largest difference in temperature between these two hours and for some days in the summer, this situation has yet to happen for Des Moines. Friday will be a different situation with warmer air and sunshine both conspiring to push us to just above freezing!

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