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Wind Chill Factors What is 'Windchill'? This is the temperature that you feel because the wind makes you colder. Let's suppose that the thermometer reads 0 degrees Fahrenheit outside with a wind speed of 20 miles per hour. The windchill factor makes you feel that the temperature is -22 degrees F. Another way to explain it is that it is just the same as blowing across the surface of a cup of hot tea to cool it. Therefore the wind carries the heat away from the tea much faster. Where did the idea come from? From experiments in Antarctica in 1945, but these have now been revised by the Amercian and Canadians to make the wind chill formula figures more realistic. The new tables are as shown here.
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