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date: 25 September 2020

windchill (factor) 

A Dictionary of Weights, Measures, and Units

Donald Fenna

Canada A composite of temperature and wind speed, constructed to reflect the greater freezing effect, particularly on hairless human skin and flesh, of low temperatures when accompanied by significant wind. The initial form consisted merely of subtracting the Fahrenheit temperature from the wind speed measured in miles per hour, e.g. a wind of 20 m.p.h. and a temperature of -30°F gave a windchill of 50, equatable with -50°F in calm conditions. The real effect is far from linearly additive in such a simple (and convenient) manner. Careful study has produced more complex formulations, convertible to a rate of heat loss and to rapidity of the freezing of the flesh.... ...

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