In cold weather, meteorologists report an index called the windchill factor, that takes into account the wind speed and the temperature. The index provides a measure of the chilling effect of wind at a given air temperature. Windchill may be approximated by the formula: W = 13.12 +0.6215 x1-11.37 xv0.16 +0.3965 XIX V0.016 Where: v t W wind speed in m/sec temperature in degrees Celsius: t