Calculate the wind chill temperature — how cold it actually feels — from wind speed and air temperature.
This calculator uses the North American wind chill formula adopted by the US National Weather Service and Environment Canada: WC = 35.74 + 0.6215T − 35.75V0.16 + 0.4275TV0.16, where T is air temperature in °F and V is wind speed in mph. It's valid for temperatures at or below 50°F and wind speeds of at least 3 mph.
Moving air strips away the thin layer of warmed air your body maintains near your skin, speeding up heat loss through convection. Faster wind means faster heat loss, which your body perceives as a lower temperature even though the air itself hasn't actually changed.
The formula was derived from cold-weather skin heat-loss models and isn't valid or meaningful at warmer temperatures — for hot, humid weather, see our Heat Index Calculator instead.
No — wind chill depends only on temperature and wind speed. Humidity's effect on perceived temperature is captured separately by the heat index, used for warm weather instead.
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