Wind Chill is a mysterious and often misunderstood phenomenon. This describes what the wind chill factor really is and offers a form to calculate the wind chill factor when given the air temperature and wind speed. 

Wind Chill: 
A measure of the cooling effect of wind. Wind increases the rate at which a body loses heat, so the air on a windy day feels cooler than the temperature indicated by a thermometer. This heat loss can be calculated for various combinations of wind speed and air temperature and then converted to a wind chill equivalent temperature (or wind chill factor).