this phenomenon,called the wide chill factor,can be calculated using the wind speed and the temperature.the wind chill factor not only gives an indication of how uncomfortable out side temperature are,it also provides a guide to help you avoid frostbite.
On a calm day,bare skin can freeze in about 1 h when it is exposed to a temperature of - 18 or less and a wind speed of 16 km/h .
at the same temperature with a wind speed of 64 km/h,frostbite can occur in just 10 min.