Thursday morning saw our coldest temperatures of the season with lows approaching zero degrees in far northwest Iowa. The featured chart presents the average first date of occurrence for a given temperature for four sites in Iowa. It is interesting to see how much closer Ames is to Sioux City than Des Moines. Davenport's climatology is about two weeks later than Ames, so for example Ames hits its first sub freezing around mid October and Davenport is toward the end of October.

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Tags:   winter