U.S. or Metric Units
at the link below.
The wind chill index combines the temperature with the wind
speed to indicate how cold it actually feels outside, particularly
to unprotected skin exposed to the wind. These calculators are based
upon the revised formula of August 2, 2001, which is available at
Note: Frostbite occurs in 15 minutes or less at wind chill values
of -18° Fahrenheit (-28° Celsius) or lower.