This calculator computes the wind chill temperature based on the new formula provided by the National Weather Service.
The program is operated by entering a temperature in degrees Fahrenheit (°F) and wind speed in miles/hour, and then pressing the Calculate button. The calculator will display the windchill temperature and a message describing the possible effects. Consult the National Weather Service for an authoritative interpretation. All entries are cleared by pressing the Clear button. If the wind speed or temperature are not in the valid range, an error dialog will pop-up.
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The Java Script source code for this program can be viewed by using the View|Source command of your web browser.
You may use or modify this source code in any way you find useful, provided that you agree that the author has no warranty, obligations or liability. You must determine the suitablility of this source code for your use.
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The National Weather Service improved the way the wind chill temperature is calculated in 2001. The previous index was the 1945 Siple and Passel Index.
The new formula is:
Twindchill = 35.74 + 0.6215·T - 35.75·V0.16 + 0.4275·T·V0.16
In which temperature, T is in degrees Fahrenheit [°F] and wind velocity, V is in miles per hour.
See also:
National Weather Service Wind Chill Terms and Definitions
Extreme Cold - National Center for Environmental Health
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