Very chilly air is filtering into Iowa today and is expected to push temperatures well below freezing tonight. With temperatures below 29 degrees Fahrenheit, a hard freeze is expected. Is having such an event during the second week of April uncommon? The featured map displays the average date of last sub 29 degree low temperature for the spring season over the Midwest based on period of record data. Of course, the further south you go, the longer past average date this event would be.

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Tags:   freeze   frost