Wind chill calculator
Enter the air temperature and wind speed to see how cold it feels on exposed skin.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter air temperature, temperature unit, wind speed and speed unit.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16, with T in °F and V in mph (NWS 2001 formula). Valid for T ≤ 50°F and V ≥ 3 mph.
Example
Inputs: Air temperature = -5, Temperature unit = Celsius (°C), Wind speed = 20, Speed unit = km/h. Result: Wind chill: -11.5 °C; In the other unit: 11.2 °F; Difference from air temperature: -6.5 °C.
Limits and caveats
- Describes the effect on the exposed face of an adult walking; it does not apply to objects.
- Sunshine and humidity are not included; strong sun can make it feel warmer.
Questions about this tool
Can wind chill alone freeze water?
No. Objects never cool below the air temperature; wind only speeds up heat loss from skin.
Why does it not work above 10°C?
The NWS formula was built and tested for cold weather; above that, wind chill is not defined.
At what height is the wind speed measured?
The formula uses wind measured at 10 metres, as weather reports give it.