Here is how you calculate the Old Wind Chill Index:
Old Wind Chill T(wc)=.081 x (3.71 x sqrt(V) + 5.81 - 0.25 x V) x (T - 91.4) + 91.4
Here is how you calculate the New Wind Chill Index:
New Wind Chill T(wc) = 35.74 + 0.6215T - 35.75(V
) + 0.4275T(V
where T(wc) is the Wind Chill in degrees F, V is the Wind Speed in MPH, and T is the temperature in degrees F.