Wind Chill Calculator.

Calculate the perceived "feels-like" temperature in cold and windy conditions. Uses the NWS 2001 wind chill equation with frostbite risk estimate.

Air Temperature

Wind Speed

How to calculate wind chill

Enter the air temperature.
Enter the wind speed.
Read the wind chill — the equivalent still-air temperature your skin experiences.
Check the frostbite band, which tells you how long exposed skin can safely stay out.

About Wind Chill

Wind chill is the perceived decrease in air temperature felt by the body due to the flow of cool air. Wind increases the rate of heat transfer from the body's surface, making it feel colder than the actual temperature.

This calculator uses the NWS 2001 formula: WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16 (where T is in °F and V is in mph). The formula is valid for temperatures at or below 10°C (50°F) and wind speeds above 4.8 km/h (3 mph).

Frostbite can occur when wind chill temperatures drop below −27°C (−17°F). Exposed skin can freeze in 30 minutes at this level, in 10 minutes below −35°C, and in less than 5 minutes below −45°C. Always dress in layers and cover exposed skin in extreme wind chill conditions.

Frequently Asked Questions

What is wind chill?

Wind chill is how cold it feels on exposed skin when wind strips away the thin layer of warm air next to it. At −10 °C with a 30 km/h wind it feels like −19.5 °C; at 0 °F with a 15 mph wind it feels like about −19 °F.

How is wind chill calculated?

With the 2001 formula used by the US and Canadian weather services: WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16, with T in °F and V in mph. It is valid at or below 10 °C (50 °F) and for winds above 4.8 km/h (3 mph).

At what wind chill does frostbite start?

Exposed skin can freeze within 30 minutes once the wind chill falls below about −27 °C (−17 °F), within 10 minutes below −35 °C, within 5 minutes below −45 °C, and in under 2 minutes beyond that. The calculator shows which band your conditions fall in.

Can wind chill freeze water or cool a car below the air temperature?

No. Wind chill describes heat loss from warm skin. An object with no heat source of its own, like a pipe or a car, cools faster in wind but never drops below the actual air temperature, so water will not freeze above 0 °C however strong the wind.

Sources · Reviewed 24 September 2026

US National Weather Service: wind chill chart and 2001 formula