1939: Unseasonably warm weather across Iowa brought the temperature up to 70 degrees or higher at about a dozen stations around the state. At Sioux City the high of 71 F set an all-time December record at that location, while a reading of 74 F at Thurman marked the highest December temperature ever recorded anywhere in Iowa. Other reported high temperatures included 73 F at Shenandoah, 70 F at Guthrie Center, and 69 F at Atlantic, Carroll, Des Moines, Little Sioux, and Winterset.
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This post was written by Schnack on December 6, 2012