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Wind Chill Calculator — NWS Formula, °C/°F & Wind Units

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Temperature unit Air temperature For NWS wind chill, air temperature must be at or below 10°C / 50°F.Wind speed unit Wind speed For NWS wind chill, wind must be above 4.8 km/h / 3 mph.

Calculated result

-12.3 °C / 9.8 °F wind chill

Actual air temperature: -5 °C / 23 °F

Wind speed: 15.5 mph / 25 km/h

Feels-like difference from air temperature: -13.2 °F (-7.3 °C)

NWS validity check: temperature ≤ 50 °F and wind > 3 mph — satisfied

Wind-speed scenarios at 23 °F air temperature

Wind mph	Wind km/h	Wind chill °F	Wind chill °C
5	8	16.5	-8.6
10	16.1	12.6	-10.8
15	24.1	10.1	-12.2
20	32.2	8.2	-13.2
30	48.3	5.4	-14.8

Show the working

1. Normalize inputs for the NWS equation: -5 °C = 23 °F; 25 kmh = 15.53 mph.
2. V^0.16 = 15.53^0.16 = 1.550981.
3. WC = 35.74 + 0.6215(23) − 35.75(1.550981) + 0.4275(23)(1.550981).
4. WC = 9.84 °F = -12.31 °C.

The NWS wind-chill index assumes exposed skin, no solar warming and a standardized wind/face model. Bright sunshine can make it feel warmer. Wind chill is not a frostbite timer, and official cold-weather alerts should control safety decisions.

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