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DOE-EM-STD-5503-94
The windchill factor is the cooling effect of any combination of temperature and wind velocity or
air movement. The windchill index (Table 6-2) should be consulted when planning for exposure
to low temperatures and wind. The windchill index does not take into account the specific part
of the body exposed to cold, the level of activity which affects body heat production, or the
amount of clothing being worn.
TABLE 6-2
Windchill Index
ACTUAL THERMOMETER READING (F)
Wind Speed
50
40
30
20
10
0
-10
-20
-30
-40
in mph
EQUIVALENT TEMPERATURE (F)
calm
50
40
30
20
10
0
-10
-20
-30
-40
5
48
37
27
16
6
-5
-15
-26
-36
-47
10
40
28
16
4
-9
-21
-33
-46
-58
-70
15
36
22
9
-5
-18
-36
-45
-58
-72
-85
20
32
18
4
-10
-25
-39
-53
-67
-82
-96
25
30
16
0
-15
-29
-44
-59
-74
-88
-104
30
28
13
-2
-18
-33
-48
-63
-79
-94
-109
35
27
11
-4
-20
-35
-49
-67
-82
-98
-113
40
26
10
-6
-21
-37
-53
-69
-85
-100
-116
LITTLE
INCREASING
GREAT
Over 40 mph
DANGER
DANGER
DANGER
(little added
effect)
(for properly clothed person)
(Danger from freezing of exposed flesh)
The human body senses "cold" as a result of both the air temperature and the wind velocity. Cooling of exposed flesh
increases rapidly as the wind velocity goes up. Frostbite can occur at relatively mild temperatures if wind penetrates the
body insulation. For example, when the actual air temperature of the wind is 40 F (4.4 C) and the velocity is 30 mph
(48 km/h), the exposed skin would perceive this situation as an equivalent still air temperature of 13 F (-11 C).
The generally recognized cold disorders or conditions are frostbite and hypothermia.
Contributing factors to these disorders or conditions are:
Exposure to humidity,
High winds,
Contact with wetness,
6-5


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