1964: An area of high pressure moved across Iowa on August 13-14 bringing clear skies and light winds that allowed temperatures to plummet across portions of the state two nights in a row, resulting in record lows at many locations. By the morning of the 14th the high pressure was beginning to move away and temperatures were somewhat warmer across most of the state, except in northeastern Iowa where the cold air still dominated and sent the temperature all the way down to 32 F at Saratoga making this the earliest August freeze ever recorded in Iowa. Other low temperatures on the morning of the 14th included 33 F at Elkader, 36 F at Decorah, 37 F at Fayette, and 38 F at Grundy Center and Oelwein.
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This post was written by Schnack on August 14, 2012