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Wind Chill Calculator

Calculate the apparent wind chill temperature from air temperature and wind speed, using the NWS formula.

Wind Chill & Apparent Temperature

Apparent Wind Chill Temperature:
16.5 °F (-8.6 °C)
❄️ Freezing Conditions
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Calculation Guide & Reference

Wind Chill (Apparent Temperature) Mathematics

Wind chill calculator computes the apparent (feels-like) temperature from air temperature and wind speed, using the NWS formula.

Standardized Mathematical Formula
WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16

The US National Weather Service wind chill formula combines air temperature (T, °F) and wind speed (V, mph) to estimate how cold exposed skin actually feels — wind accelerates heat loss from skin beyond what the thermometer alone indicates.

Variables:
T:Air temperature, in °F
V:Wind speed, in mph
How It Works (Step-by-Step)
  • 1Enter the air temperature (°F) and wind speed (mph).
  • 2View the apparent wind chill temperature — the formula only applies at or below 50°F with wind ≥ 3 mph, per NWS convention.
Real-World Numerical Example
28°F with 15 mph Wind

The air temperature is 28°F, with a 15 mph wind.

•WC = 35.74 + 0.6215(28) − 35.75(15^0.16) + 0.4275(28)(15^0.16)
•≈ 35.74 + 17.40 − 51.19 + 34.05 ≈ 16.0°F.
Result: A 28°F day with 15 mph winds feels like approximately 16°F.

Frequently Asked Questions (FAQ)

Wind strips away the thin layer of warm air your body naturally holds near your skin, accelerating heat loss and making the air feel colder than the actual air temperature.

The NWS considers wind chills of −18°F (−28°C) or below to pose a risk of frostbite on exposed skin within about 30 minutes; extreme values below −30°F speed that risk to just a few minutes.

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