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Wind Chill Calculator

Calculate the wind chill temperature given air temperature and wind speed. Supports °F/°C and mph/km/h with danger level indicators.

What is Wind Chill Calculator?

Wind chill is the perceived decrease in air temperature felt by the body due to the flow of air. The wind chill calculator uses the official NWS formula to tell you how cold it actually feels outside when wind is factored in.

How to use

  1. 1 Select your temperature unit (°F or °C).
  2. 2 Enter the current air temperature.
  3. 3 Select your wind speed unit (mph or km/h).
  4. 4 Enter the wind speed.
  5. 5 Click Calculate — the formula is valid for temperatures at or below 50°F (10°C) and wind speeds at or above 3 mph (4.8 km/h).

Formula

Wind Chill (°F) = 35.74 + 0.6215×T − 35.75×V^0.16 + 0.4275×T×V^0.16, where T = air temp in °F and V = wind speed in mph.

Example calculation

At 20°F with 15 mph wind: WC = 35.74 + 0.6215×20 − 35.75×15^0.16 + 0.4275×20×15^0.16 ≈ 6°F. It feels 14 degrees colder than the actual temperature.

Frequently asked questions

At what wind speed does wind chill matter?

Wind chill is significant at speeds above 3 mph (4.8 km/h). Below that, the effect is minimal and the formula is not valid.

Does wind chill apply above 50°F?

No. The NWS formula is only valid at or below 50°F (10°C). At warmer temperatures, wind can actually feel refreshing rather than colder.

Can exposed skin freeze at high wind chills?

Yes. At wind chill values below −18°F (−28°C), exposed skin can freeze in 30 minutes. Below −55°F (−48°C), frostbite is possible in under 5 minutes.

Does wind chill affect objects?

Wind chill only affects living tissue that generates heat. It does not cause inanimate objects (like pipes) to freeze faster than the actual air temperature.

What danger level should I worry about?

Be cautious at 'Cold' (WC < 10°F), limit exposure at 'Very Cold' (WC < −10°F), and avoid outdoor exposure at 'Extreme' (WC < −30°F).