Old Wind Chill Chart
This formula was officially used in the United States through October, 2001.
Credits to www.weatherimages.org.
The New (now current) formula for Fahrenheit temperatures:
• Wind chill temperature = 35.74 + 0.6215T - 35.75V (**0.16) + 0.4275TV(**0.16)
In the formula, V is in the wind speed in statute miles per hour, and T is the temperature in degrees Fahrenheit.
Note: In the formula, ** means the following term is an exponent (i.e. 10**(0.5) means 10 to the 0.5 power, or the square root of V), - means to subtract,+ means to add. A letter next to a number means to multiply that quantity represented by the letter by the number. The standard rules of algebra apply.
Some links for more information:
Note: The new windchill calculation began to be used on this site starting in Nov or Dec, 2001.