1970: Very cold weather settled across Iowa from January 18-21 with a statewide average temperature of -11.2 F over that stretch and numerous stations recording low temperatures of -25 F or colder on all four days. The coldest temperatures came on the 21st when reported lows included -24 F at Des Moines, -27 F at Harlan and Toledo, -28 F at Indianola, -31 F at Le Mars and Waterloo, -32 F at Clarion and Decorah, and -33 F at Cherokee.
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This post was written by Schnack on January 21, 2013