Has the lower 48 ever registered a high temperature less than 70 degrees?

Dear Tom,
I noticed the nation’s highest temperature was just 72 degrees in Miami on Tuesday. Has the lower 48 ever registered a high temperature less than 70 degrees?
— Adrian Demus
Dear Adrian,
The answer is yes, but it is a rare event. We checked the National Weather Service archive of national extremes, which date back to November 2011, and found nothing lower than 72. We contacted University of Wisconsin at Green Bay geoscience Professor Emeritus Steven Dutch, who cataloged the USA Today national temperature extremes from 1995-2006, and he provided the following: During a Christmas cold snap from Dec. 22-24, 1995, there were eight sub-70-degree national highs, the lowest being 66 degrees in Parker, Ariz., and several California locations including Coronado, Thermal, National City and Monterey.

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