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On December 30, 1968, the weather station at the University of Idaho, Moscow, recorded a low temperature of − 42°F. Examination of the weather records back to 1930 showed that − 42°F was the coldest temperature experienced over this time period, although the mercury dropped below − 20°F in 5 of these 38 years and below −30°F in 1 year.
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Alan A. Berryman (1970) studied this question.
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