The Dangers of Windchill

Wind chill is the apparent temperature felt on exposed skin, which is a function of the air temperature and wind speed.  The wind chill temperature (often popularly called the wind chill factor) is always lower than the air temperature, except at higher temperatures where wind chill is considered less important.

For instance, with a 27.8-kph (15-knot) wind and a temperature of -10 degrees C, the equivalent windchill temperature is -23 degrees C.

The picture below gives the windchill factors for various temperatures and wind speeds.

Remember, even when there is no wind, you will create relative wind by skiing, running, being towed on skis behind a vehicle, working around aircraft that produce wind blasts.