Wind chill has become a common winter statistic in weather forecasts.
It is based on the fact that a windy cold day feels far colder to living creatures than a windless one. In fact, at frigid temperatures, wind can make the difference between life and death.
A -40° Fahrenheit (-40° Celsius) calm day can be less hazardous than a 32° Fahrenheit (0° Celsius) day with a strong wind. To determine wind chill, all you need to do is multiply the wind speed by 1.5 and subtract it from the temperature.