Personal AccuWeather : Windchill Chart & Description

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Contrary to what some believe, the wind chill factor does not lower the air temperature. It does not matter how strong the wind is; the temperature remains constant unless progressively colder air is moving into the region. The wind chill factor is a measure of how fast heat is being removed from your body. If the air temperature is 40 degrees and the wind is blowing at 20 miles per hour, it feels the same as 20 degrees with no wind at all.

Wind Speed	Cooling Power of Wind Expressed as "Equivalent Chill Temperature"
MPH	Temperature (degrees F)
Calm	40	35	30	25	20	15	10	5	0	-5	-10	-15	-20	-25	-30	-35	-40	-45	-50	-55	-60
	Equivalent Chill Temperature
5	35	30	25	20	15	10	5	0	-5	-10	-15	-20	-25	-30	-35	-40	-45	-50	-55	-65	-70
10	30	20	15	10	5	0	-10	-15	-20	-25	-35	-40	-45	-50	-60	-65	-70	-75	-80	-90	-95
15	25	15	10	0	-5	-10	-20	-25	-30	-40	-45	-50	-60	-65	-70	-80	-85	-90	-100	-105	-110
20	20	10	5	0	-10	-15	-25	-30	-35	-45	-50	-60	-65	-75	-80	-85	-95	-100	-110	-115	-120
25	15	10	0	-5	-15	-20	-30	-35	-45	-50	-60	-65	-75	-80	-90	-95	105	-110	-120	-125	-135
30	10	5	0	-10	-20	-25	-30	-40	-50	-55	-65	-70	-80	-85	-95	-100	-110	-115	-125	-130	-140
35	10	5	-5	-10	-20	-30	-35	-40	-50	-60	-65	-75	-80	-90	-100	-105	-115	-120	-130	-135	-145
40	10	0	-5	-15	-20	-30	-35	-45	-55	-60	-70	-75	-85	-95	-100	-110	-115	-125	-130	-140	-150
	Little Danger					Increasing Danger (Flesh may freeze within 1 min.)						Great Danger (Flesh may freeze within 30 sec.)

Danger of freezing exposed flesh for properly clothed persons
(Note: Winds above 40 mph have little additional effect)