A remarkable stretch of late December warmth gets underway today with increasing humidity levels helping to buoy overnight temperatures as well. Low temperatures over the next few days are forecast to be above 40 degrees for much of Iowa. The featured chart looks at the hourly frequency of having such a warm temperature by week of the year. Having such temperatures during the morning hours in late December has a frequency of less than 5%. This situation becomes more rare during the overnight hours in January and into February.

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