Wind Chill Calculator
Find how cold it feels outside when wind is added to the temperature, using the NWS wind chill formula.
About the Wind Chill Calculator
Enter the air temperature and wind speed, in °F with mph or °C with km/h. The calculator gives the wind chill (how cold it feels on exposed skin) and the frostbite risk.
Wind carries heat away from exposed skin faster. The 2001 wind chill index used by the US NWS and Environment Canada is based on heat loss from the face at walking speed. It's defined for temperatures at or below 50 °F and wind speeds of 3 mph or more.
The formula
WC = 35.74 + 0.6215 T − 35.75 V^0.16 + 0.4275 T V^0.16 (°F, mph)
Worked example
20 °F (−6.7 °C) with a 15 mph wind
- NWS wind chill formula
- Feels like 6.2 °F (−14.3 °C)
- Low frostbite risk for most people
Questions people ask
Can wind chill freeze water?
No; objects can't cool below the actual air temperature.
When is frostbite a risk?
Wind chills below about −18 °F (−28 °C) can cause frostbite in 30 minutes.