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Wind Chill Calculator


Wind Chill
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).
Wind Speed (MPH) =
Air Temperature (F) =

Old Wind Chill Index
New Wind Chill Index

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(

V = wind speed (mph)
T = temperature (F)



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