| Air temperature | |
| unit | F C |
| Wind speed | |
| unit | mph kmh |
This formula is based upon the National Weather Service's updated Windchill Temperature Index. Temperature is adjusted for the effects of windspeed on apparent temperature as wind results in an apparent temperature that is colder than that measured by a thermometer.
Formula:
T = Air temperature in °F
V = Wind speed in mph
Wind Chill (°F) = 35.74 + (0.6215 × T) - (35.75×V^0.16 ) + (0.4275 × T × V^0.16)
Reference:
National weather Service [NWS]. NWS Windchill Chart. http://www.nws.noaa.gov/os/windchill/index.shtml. Updated December 17, 2009. Last accessed May 31, 2013.