A measure of the cooling effect of wind. Wind
increases the rate at which a body loses heat, so the air on a windy day feels cooler than
the temperature indicated by a thermometer. This heat loss can be calculated for various
combinations of wind speed and air temperature and then converted to a wind chill
equivalent temperature (or wind chill factor).
The formulas used to calculate the wind chill index are:
Old Wind Chill Index (Pre-November 2001) =
91.4 - (0.474677 - 0.020425 * V + 0.303107 * sqrt(V)) * (91.4 - T)
New Wind Chill Index =
35.74 + 0.6215T - 35.75(V0.16) + 0.4275T(V0.16)
V = wind speed (mph)
T = temperature (F)
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