Wind chill calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- US National Weather Service formula: WC = 35.74 + 0.6215T − 35.75 V^0.16 + 0.4275 T V^0.16 (T in °F, V in mph).
- With T = 20 and V = 15 the result is 6.22°F.
- It is valid only in the ranges stated above; it does not include sunshine or humidity.
| Inputs | Answer |
|---|---|
| Air temperature: 20; Wind speed: 15; Units: °F and mph | At 20°F with a 15 mph wind, the wind chill is 6.2°F (it feels that cold on bare skin). |
| Air temperature: 0; Wind speed: 30; Units: °C and km/h | At 0°C with a 30 km/h wind, the wind chill is -6.5°C (it feels that cold on bare skin). |
| Air temperature: -10; Wind speed: 20; Units: °F and mph | At -10°F with a 20 mph wind, the wind chill is -35.1°F (it feels that cold on bare skin). |
How to use it
Wind chill is how cold the air feels on exposed skin when wind carries heat away. The calculator uses the formula adopted by the US National Weather Service and Environment Canada: WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16 for °F and mph, or 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16 for °C and km/h.
It is valid only for air temperatures at or below 50 °F (10 °C) and wind speeds of at least 3 mph (4.8 km/h), and it does not account for sunshine or humidity. Wind chill affects people and animals, not objects, which only cool to the air temperature.
Frequently asked questions
What is wind chill?
The cooling effect of wind on exposed skin, expressed as an equivalent temperature.
Does wind chill apply to cars and pipes?
No, objects only cool to the actual air temperature, though wind makes them get there faster.
What is the wind chill formula?
WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16 (°F, mph).
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.