Find how cold it feels on exposed skin from air temperature and wind speed.
Wind chill is the “feels like” temperature when wind strips heat from exposed skin. At −10 °C with a 20 km/h wind it feels like about −18 °C. The formula applies at or below 10 °C (50 °F) with wind of at least 4.8 km/h (3 mph).
Wind makes cold air feel colder because it carries heat away from your skin faster. The wind chill index combines air temperature and wind speed into a single equivalent temperature. This calculator uses the North American (US NWS and Environment Canada) formula, accepts °C or °F and km/h, mph or m/s, and shows the result with the frostbite risk.
Wind chill matters for hikers, skiers, runners, workers outdoors and anyone travelling to cold places such as Ladakh, Kashmir or Himachal in winter. It affects people and animals but not objects such as car engines or water pipes, which cool only to the air temperature. For heat, use the Heat Index Calculator.
The calculator uses the standard wind chill equation.
| Air temperature | Wind | Wind chill | Frostbite risk |
|---|---|---|---|
| -10 °C | 20 km/h | -17.9 °C · -0.1 °F | Low risk, but uncomfortable — dress warmly |
| -20 °C | 30 km/h | -32.6 °C · -26.6 °F | Frostbite in about 10–30 minutes |
| -30 °C | 30 km/h | -45.6 °C · -50.1 °F | Frostbite in about 5–10 minutes |
| 0 °F | 15 mph | -28.6 °C · -19.5 °F | Frostbite in about 10–30 minutes |
| 20 °F | 10 mph | -12.9 °C · 8.8 °F | Low risk, but uncomfortable — dress warmly |
| -20 °F | 30 mph | -47.3 °C · -53.1 °F | Frostbite in about 5–10 minutes |
| Wind chill | Risk |
|---|---|
| −10 to −27 °C | Low risk; uncomfortable — dress warmly |
| −28 to −39 °C | Frostbite possible in 10–30 minutes |
| −40 to −47 °C | Frostbite possible in 5–10 minutes |
| −48 to −54 °C | Frostbite possible in 2–5 minutes |
| −55 °C and colder | Frostbite possible in under 2 minutes |
How cold the air feels on exposed skin when wind is added to the air temperature.
With the NWS / Environment Canada equation: WC = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16 (T in °C, V in km/h).
At air temperatures of 10 °C (50 °F) or below and wind speeds above about 4.8 km/h (3 mph).
Below about −28 °C, frostbite can occur on exposed skin in 10–30 minutes; colder values shorten that time.
No. A car or a pipe cools only to the air temperature; wind chill describes the rate of heat loss from skin.
About −17.9 °C.
The formula was developed for cold conditions. In warm weather use the Heat Index Calculator.
Yes — choose the unit beside the wind speed and the calculator converts it.
No. Sunshine can make it feel a few degrees warmer; the formula assumes clear night conditions.
No. Everything runs in your browser.
