| Summary: | Military equipment must be designed to operate at very cold temperatures, at extremes that have a small probability of being attained, perhaps only a few hours a month. The percentage of time during the coldest month that temperatures as cold or colder than -40, -50, -60, and -70F are estimated and mapped for the Northern Hemisphere. Maps of 1, 2, 5, 10 and 20 percent probable low temperatures for the coldest month, based on actual hourly temperature distributions, were available for North America, so that only Greenland and Eurasia needed mapping for completion of the Northern Hemisphere. This was accomplished by developing regression equations which related the departure of the 1,5,10 and 20 percentile lowest hourly temperatures from the monthly mean to the mean daily range of temperature; also, estimates of hourly percentile values of low temperatures were made from available six hour temperature distributions for several stations in Siberia. (Author). Research supported by the Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, L.G. Hanscom Field, Bedford, Massachusetts. Aerospace Instrumentation Laboratory Project 8624. AD0707092 (from http://www.dtic.mil). "March 1970." Includes bibliographical references (page 15). Military equipment must be designed to operate at very cold temperatures, at extremes that have a small probability of being attained, perhaps only a few hours a month. The percentage of time during the coldest month that temperatures as cold or colder than -40, -50, -60, and -70F are estimated and mapped for the Northern Hemisphere. Maps of 1, 2, 5, 10 and 20 percent probable low temperatures for the coldest month, based on actual hourly temperature distributions, were available for North America, so that only Greenland and Eurasia needed mapping for completion of the Northern Hemisphere. This was accomplished by developing regression equations which related the departure of the 1,5,10 and 20 percentile lowest hourly temperatures from the monthly mean to the mean daily range of temperature; also, estimates of hourly percentile values of low temperatures were made from available six hour temperature distributions for several stations in Siberia. (Author). Mode of access: Internet.
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