Wind Chill Calculator
Calculate the wind chill (feels-like) temperature from air temperature and wind speed.
Supports Fahrenheit/Celsius and mph/km/h.
Wind Chill Temperature
Wind chill describes how cold it feels on exposed skin when wind is factored in. The NWS uses the following formula:
Fahrenheit formula (NWS):
Wind Chill (°F) = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16
Where T = air temperature (°F), V = wind speed (mph)
Celsius formula:
Wind Chill (°C) = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16
Where T = air temperature (°C), V = wind speed (km/h)
Validity range:
- Temperature: At or below 50°F (10°C)
- Wind speed: Above 3 mph (5 km/h)
Unit conversions:
- °F to °C:
(°F − 32) × 5/9 - °C to °F:
(°C × 9/5) + 32 - mph to km/h:
mph × 1.609 - km/h to mph:
km/h × 0.621
Frostbite risk by wind chill:
- Above 0°F (−18°C): Low risk
- 0°F to −20°F (−18°C to −29°C): 30 minutes to frostbite
- −20°F to −35°F (−29°C to −37°C): 10 minutes to frostbite
- Below −35°F (−37°C): 5 minutes to frostbite — dangerously cold