For Ames, this March we had one stretch of five days with the high temperature only maxing out at 31 degrees. Has this cold of a period become more of less common? The featured chart attempts to answer that question by looking at the distribution of max five day high temperatures comparing the 30 year period before 1987 to the same number of years afterwards. The answer to the question comes with the split violin charts on the left hand side. The later year period shows a shift upward in distribution and a remarkable vacating of the lowest temperature frequencies. The meaning being that the periods of very cold temperatures are less frequent than they have been.

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Tags:   mar