Wind chill calculator

Wind chill is how cold it feels on exposed skin as wind carries heat away from your body. Enter the temperature and wind speed to calculate it with the National Weather Service formula.

Reviewed October 2026

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How it's calculated

The National Weather Service formula, where T is the air temperature in °F and V is the wind speed in mph:

Wind chill = 35.74 + 0.6215T − 35.75(V^0.16) + 0.4275T(V^0.16)

Wind chill is defined only for temperatures at or below 50°F and wind speeds above 3 mph. Outside that range, the calculator shows the air temperature.

What the number means

The lower the wind chill, the faster exposed skin can freeze. The National Weather Service gives this example: at 0°F with a 15 mph wind, the wind chill is −19°F, and exposed skin can freeze in 30 minutes. Cover up, limit time outside, and check your ZIP code in the forecast for cold weather alerts.

Sources

• Wind Chill Chart, National Weather Service