Wind Chill Chart

Wind Speed-MPH
Calm 5 10 15 20 25 30 35
Temperature
(Degrees F)		 Apparent
Temperature
45 43 34 29 26 23 21 20
40 37 28 23 19 16 13 12
35 32 22 16 12 8 6 4
30 27 16 9 4 1 -2 -4
25 22 10 2 -3 -7 -10 -12
20 16 3 -5 -10 -15 -18 -20
15 11 -3 -11 -17 -22 -25 -27
10 6 -9 -18 -24 -29 -33 -35
5 0 -15 -25 -31 -36 -41 -43
0 -5 -22 -31 -39 -44 -49 -52
-5 -10 -27 -38 -46 -51 -59 -64
-10 -15 -34 -45 -51 -59 -64 -67
-15 -21 -40 -51 -60 -66 -71 -74
-20 -26 -46 -58 -67 -74 -79 -82
-25 -31 -52 -65 -74 -81 -86 -89

The wind chill factor, which only affects humans and animals, causes the air to feel colder than it really is. This helps us to understand how cold it feels outside! Moving air carries heat away from the body more effectively than air that is not moving. If there is no wind, the heat radiating from a person's body will stay near the body and warm the air around it. Therefore, the wind chill is simply a means of describing the effect of the movement of air on the heat loss of a person's body.

The US National Weather Service uses the following formula to calculate wind chill:

WC = 91.4 - (0.474677 - 0.020425 * V + 0.303107 * SQRT(V)) * (91.4 -T)

where: WC = Wind Chill Index
V = wind speed (mph)
T = temperature (° F)

Note: When wind speeds are below 4 mph., the above formulas will give you a wind chill that is higher than the actual temperature. When wind velocities are near zero and you are standing still, your body heat warms the air near your body. This warm air near your body provides some insulation from the colder environment. As a result, it may actually feel warmer than the actual temperature.