Wind Chill Calculator
National Weather Service 2001 wind chill. Type air temperature in Fahrenheit and wind speed in miles per hour. The formula still prints outside T ≤ 50 °F and wind ≥ 3 mph, with a range note. Not a forecast.
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How to compute NWS 2001 wind chill
- Enter air temperature in degrees Fahrenheit. The default is 20 °F.
- Enter wind speed in miles per hour, 0 or greater. The default is 10 mph.
- Read wind chill in °F and the Celsius conversion of that wind-chill value.
- If temperature is above 50 °F or wind is under 3 mph, the page still shows the formula and flags the NWS range. This is not a forecast.
NWS 2001 wind chill
Standard wind chill equivalent temperature
| Formula | 35.74 + 0.6215 T - 35.75 v^0.16 + 0.4275 T v^0.16 |
|---|---|
| T | Air temperature in °F |
| v | Wind speed in mph |
| Valid range | T ≤ 50 °F and wind ≥ 3 mph |
| Celsius row | Conversion of the wind-chill °F, not a second formula |
| Advice | Not a forecast. Not frostbite guidance. |
What NWS 2001 wind chill is
Wind chill is an equivalent temperature that describes how the air feels on exposed skin when wind strips heat. The United States National Weather Service adopted the 2001 fit. It is not the older 1945 Siple-Passel chart and not the Environment Canada index with different coefficients. Convert a Celsius air temperature on the temperature converter before you type °F here. Heat index is a hot-weather sibling on the heat index page.
How this page computes wind chill
WC = 35.74 + 0.6215 T - 35.75 v^0.16 + 0.4275 T v^0.16, with T in °F and v in mph. Wind cannot be negative. The page reports whether T ≤ 50 and v ≥ 3. Outside that window the number still appears because the algebra is defined, but NWS does not treat it as the operational index. Celsius is (WC - 32) × 5/9 of the wind-chill result, not of the air temperature.
Wind, skin, and related apparent temperatures
The index assumes a certain walking speed and face height. Calm air uses a floor near 3 mph in the official product. Sunshine, wet clothing, and frostbite times are separate NWS charts. This page does not print a frostbite clock. A city forecast needs a weather service, not this form.
Use cases
A homework check of the 2001 polynomial, or converting a backyard thermometer and an anemometer reading you already trust. Not clothing advice and not a school-closure product.
Limits
Inputs are °F and mph only. No live METAR. No frostbite table. Wind cannot be negative. CZNull does not receive the numbers.