🥶 Wind Chill Calculator
Calculate how cold it actually feels outside using the US National Weather Service wind chill formula.
Weather Conditions
Your Result
The NWS wind chill formula applies to temperatures at or below 50°F (10°C) and wind speeds of 3 mph (5 km/h) or more.
How the Wind Chill Calculator Works
Wind chill describes how much colder moving air makes it feel compared to the still-air temperature, because wind accelerates heat loss from exposed skin. This calculator uses the official US National Weather Service (NWS) wind chill formula, introduced in 2001.
Formula
where T = air temperature in °F, V = wind speed in mph
Valid Range
This formula is designed for temperatures at or below 50°F (10°C) with wind speeds of at least 3 mph (5 km/h). Outside that range, wind has little meaningful cooling effect and the formula is not applicable — the calculator will note this and simply show the actual temperature.
Frequently Asked Questions
What formula does this calculator use?
It uses the official US National Weather Service wind chill formula, adopted in 2001, which is based on skin heat-loss models and modern wind measurement standards.
Why doesn't wind chill apply above 50°F?
Above 50°F, wind has minimal effect on how cold the air feels to exposed skin, so the NWS formula is only valid at or below this threshold.
Does wind chill affect the actual air temperature?
No. Wind chill only describes the rate of heat loss from exposed skin — it does not change the actual air temperature or affect non-living objects like car engines or water pipes.