![]() ![]() Note: Wind speeds above 40 mph have little additional chilling effect. It replaced the prior 1945 Siple and Passel Index, created during a United States Antarctic Expedition from 1939 to 1941. Old Wind Chill Chart (used before November 1, 2001) Wind The Windchill Temperature ( WCT) chart below was created in 2001/2002 by Environment Canada ( EC) and the U.S. Thermal Comfort Observations – Australia Bureau of Meteorology NWS Wind Chill Temperature Index – Includes a wind chill chart in PDF and high resolution TIF formats, an online calculator, and answers to frequently asked questions. Report on Wind Chill Temperature and Extreme Heat Indices: Evaluation and Improvement Projects – Office of the Federal Coordinator for Meteorology provides this report describing the joint US and Canadian replacement wind chill index project, implemented for the 2001-2002 winter season, and other extreme heat formula evaluations. The Canadian index has been harmonized with that used in the United States (although the Celsius scale is used in Canada and the Fahrenheit scale in the US), thus providing a consistent index throughout North America. The middle range of Siples 1939 wind-chill index chart isopleths has been placed as an overlay on a currently used 2001 windchill chart, adapted with permission from the US National Weather Service. Wind Chill Calculator – National Weather ServiceĮnvironment Canada’s Windchill Program – Offers a wind chill fact sheet, charts and tables, calculators and equations, and a history of the program. Note also that water will not freeze unless its temperature (not the wind chill temperature) reaches the freezing point. Wind Chill Temperature: Note that the Wind Chill is only defined for temperatures in the range -45oF to +45oF and wind speeds 3 to 60 mph. ![]() Note: Wind chill is only defined for temperatures in the range -45☏ to +45☏ and wind speeds 3 to 60 mph. Hints to the Observer WIND - CHILL CHART : KNOTS AND KILOMETERS PER HOUR VERSUS DEGREES CELSIUS RS ATL NOAA - NATIONAL WEATHER SERVICE WIND CHILL CHART. Wind Speed at 10m (33ft): mph knots m/sec km/h. ![]()
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