The wind chill factor is calculated using a formula that takes into account both the air temperature and the wind speed. Meteorologists use this formula to provide a wind chill index, which is often included in weather forecasts. The faster the wind blows, the more heat your body loses, and the colder it feels. For example, a temperature of 30°F with a 15 mph wind can feel like 19°F. This calculation helps people understand the risks of frostbite and hypothermia in cold, windy conditions.