resourcesĪ printable version of the time-to-frostbite chart may downloaded from NOAA. See and the Canadian site referenced below. It replaced an earlier index which tended to overestimate the effect of the wind at certain velocities. National Weather Service and Meteorological Services of Canada. The current version of the index was introduced in November 2001 by the U.S. To signal that they are not temperatures, values are written without the degree symbol and spoken without the word “degree.” For example, “-5F”, not “-☏” and “3 Celsius”, not “3 degrees Celsius”. The windchill temperature index makes use of the temperature scales, but it is not really a measure of temperature. Bright sunlight can make one feel as much as 12 points warmer. The windchill index does not take sunlight into account. Customary UnitsĪdapted from a National Weather Service chart. In SI units (degrees Celsius, kilometers per hour), the formula is:Ġ.2965 T ( V 0.16) Windchill calculated from U.S. The index is undefined at wind speeds below 3 miles per hour, and at temperatures above 50 degrees Fahrenheit. Where W is the windchill in degrees Fahrenheit, T is the temperature in degrees Fahrenheit, and V is the wind velocity at a height of 5 feet in miles per hour. The windchill temperature index attempts to quantify this sensation, describing it as the temperature with no wind at which one would feel equally cold. ![]() When it's cold, a good wind makes it feel colder. In the United States and Canada, a measure of apparent temperature. ☙ Share this page on Facebook Windchill Temperature Index
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