Abstract
At the Annual Meeting for 1945, a paper was presented on degree‐day units, especially on the regional contrasts in their range or variation. That paper was published in the Transactions for August, 1945 (v. 26, pp. 45–48).The term “degree‐day,” invented by a heating engineer and adopted by the United States Weather Bureau, has been applied hitherto to the sums below 65°F, for which the term “cold degree‐day units” is here proposed. The sums of the temperatures above 70°F, calculated in the same way as cold degree‐day units, is the subject of this paper. A day having a daily mean temperature of 71° has one hot degree‐day unit; a day with a mean of 85° has 15 units. Twenty days with means of 85° have a total of 300 units. The annual average number of hot degree‐day units in the United States has been laboriously calculated from “Daily Normal Temperatures in the United States,” Supplement 26 of the Monthly Weather Review, published in 1925.
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