Windchill

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Office of Climate, Water, and Weather Services
 
 

Wind Chill Chart shows temperature and wind speed at which frostbite can set in. See wind chill calculator at bottom of page for equivalent.

The NWS Windchill Temperature (WCT) index uses advances in science, technology, and computer modeling to provide an accurate, understandable, and useful formula for calculating the dangers from winter winds and freezing temperatures. The index:

  • Calculates wind speed at an average height of five feet, typical height of an adult human face, based on readings from the national standard height of 33 feet, typical height of an anemometer
  • Is based on a human face model
  • Incorporates heat transfer theory, heat loss from the body to its surroundings, during cold and breezy/windy days
  • Lowers the calm wind threshold to 3 mph
  • Uses a consistent standard for skin tissue resistance
  • Assumes no impact from the sun (i.e., clear night sky).

 Windchill Calculator:

Air Temperature  
Wind Speed 

Wind Chill Temperature:
 

 

Note: Windchill Temperature is only defined for temperatures at or below 50 degrees F and wind speeds above 3 mph. Bright sunshine may increase the wind chill temperature by 10 to 18 degrees F.


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Office of Climate, Water, and Weather Services
1325 East West Highway
Silver Spring, MD 20910
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link is http://www.weather.gov/os/windchill/index.shtml

Last Updated: December 17, 2009->->

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