Wind Chill Calculator
Compute apparent temperature from cold air + wind via the NWS formula.
Enter temperature and wind speed to compute the wind chill — the apparent temperature when cold air is moved by wind across exposed skin. Uses the official US NWS 2001 formula.
Common use cases
- Decide what to wear before going out in cold, windy weather
- Assess frostbite risk for outdoor activities
- Compare wind chill across cities for trip planning
- Convert wind chill values between °F and °C
Frequently asked questions
When is the formula valid?▾
Temperature ≤ 50 °F (10 °C) and wind speed ≥ 3 mph (5 km/h). Outside that range, wind chill is undefined.
Why doesn't wind chill apply to objects?▾
Wind chill quantifies heat loss from human skin (37 °C surface). An object can't be cooled below the actual air temperature by wind alone.
What's the formula?▾
WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16, with T in °F and V in mph.