Wind Chill Factor Calculator
Calculate the perceived air temperature accounting for wind chill using the North American/UK standard formula, valid for temperatures =10�C and wind speeds =5 km/h.
Results
What is it?
Wind chill is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air. Wind accelerates heat loss from the body's surface � the same temperature feels significantly colder in a breeze than in still air. This calculator uses the Environment Canada / NOAA standard formula adopted in 2001.
How to use
Enter the actual air temperature in �C and the wind speed in km/h. The formula is valid for temperatures at or below 10�C and wind speeds at or above 5 km/h. For warmer temperatures, the heat index (humidex) is the relevant metric instead.
Example scenario
Hiking in -10�C air with a 40 km/h wind: wind chill � -20�C. Exposed skin can freeze in under 30 minutes in those conditions. Dressing for the wind chill � not just the thermometer � is critical for cold-weather outdoor safety.
Pro tip
Frostbite risk thresholds: at wind chill below -28�C, exposed skin can freeze in 30 minutes. Below -40�C, freezing can occur in under 10 minutes. Layer up and cover all exposed skin � neck, ears, and cheeks are the most vulnerable. Moisture-wicking base layers are essential since wet clothing accelerates heat loss by up to 25�.