windchill index

wind·chill in·dex

(wind'chil in'deks)
Measure of the environment's potential to cause cold injury, based on ambient air temperature and wind velocity.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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The original "windchill index," invented by Siple and Passel (1946), combined the cooling effects of low temperatures and wind in a number that was proportional to the rate of heat transfer from a small plastic cylinder.
A windchill advisory is issued when the windchill index is expected to reach -15 to -24 degrees for at least three hours.
Windchill index values indicate the more-than-additive effect that wind has on the perception of cold.