Some of the coldest air of the season arrived over Iowa overnight. A number of locations will likely set new fall minimum temperatures. The featured chart looks at the hour at which and the new minimum fall temperature that was reported during October for Des Moines. Of interest are the very few number of reports between noon and 6 PM. This shows that it is very difficult to set new fall minimum lows during the afternoon hours as it is difficult to get very cold air into the region when even minimal amounts of sunshine can provide some heating. It will be interesting to see if this situation can happen today with very cool temperature expected this afternoon for places like Des Moines.

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Tags:   oct