๐ฅถ Wind Chill Calculator
Enter the air temperature and wind speed to calculate the wind chill โ how cold it actually feels โ using the formula adopted by the US National Weather Service (NWS) in 2001. It quantifies how wind makes cold weather feel colder than the actual temperature.
How to use
- Enter the air temperature (ยฐC).
- Enter the wind speed (km/h).
- The wind chill is calculated automatically.
How the calculation works
Wind chill describes how cold it feels on exposed skin when the wind blows. Wind strips away the layer of warm air next to the skin, so it feels colder than the actual temperature. This tool uses the formula adopted in 2001 by the US National Weather Service and Environment Canada (T in ยฐF, V in mph): Wind chill = 35.74 + 0.6215T โ 35.75V^0.16 + 0.4275TV^0.16 The Celsius and km/h inputs are converted, and the result is converted back to Celsius. The formula applies only at 10ยฐC (50ยฐF) or below with wind of about 4.8 km/h (3 mph) or more, so values outside that range are not calculated.
Worked example
0ยฐC with a 24 km/h wind โ feels like about โ5.8ยฐC โ10ยฐC with a 30 km/h wind โ about โ19.5ยฐC At the same temperature, stronger wind makes it feel colder.
Things to be aware of
- By Environment Canada's guide, below a wind chill of about โ28ยฐC exposed skin can freeze within 10 to 30 minutes.
- A common Japanese rule of thumb says wind lowers the felt temperature by about 1ยฐC per 1 m/s; that is a separate, simpler guide.
- The formula ignores sunshine, which can make it feel several degrees warmer.
FAQ
What formula is used?
The formula adopted by the US National Weather Service (NWS) in 2001 (based on ยฐF and mph), with your inputs converted accordingly.
Does this work for any conditions?
This formula is only valid when the temperature is 10ยฐC (50ยฐF) or below and wind speed is about 4.8 km/h (3 mph) or more. Outside that range, it's shown as out of range.
Can this calculate feels-like temperature for hot weather?
No, this is specifically for cold conditions. For hot weather, use this site's Heat Index Calculator instead.