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.

A variety of online sources state that “in 2002, adjustments for solar radiation (i.e., the impact of sun) for a variety of sky conditions (sunny, partly sunny and cloudy) will be added to the calculation model.” As of April 23, 2007, no such adjustments were yet available.

Use Access Key q to get to the Fahrenheit temperature input field, or Access Key z to get to the Celsius.

Calculate U.S. Wind Chill Index

Calculate Metric Wind Chill Index

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