Wind chill calculator

What cold air feels like once wind strips your heat — the NWS/Environment Canada formula, °C or °F with km/h, mph, or m/s.

Environment Canada / US NWS formula. Defined for air ≤ 10 °C; below 4.8 km/h the index equals the air temperature.

Everything runs in this browser.

How to use

  1. Enter the air temperature.
  2. Enter the wind speed.
  3. Read the wind chill and frostbite band.

What it supports

Valid for −60…10 °C with wind 0–200 km/h. Below 4.8 km/h the air is treated as calm and the air temperature is returned — the formula does not apply to still air.

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