TM 5-852-4/AFM 88-19, Chap. 4
Table 1-1. Stages of Relative Human Comfort and the Environmental Effects of Atmospheric Cooling.
Effects of Atmospheric Cooling.
2
Wind chill factor (kg cal/m hr)
Relative comfort
600
Conditions considered as comfortable when
men are dressed in wool underwear, socks,
mitts, ski boots, ski headband, and thin
cotton windbreaker suits, and while skiing
over snow at about 3 mph (metabolic
2
output about 200 kg cal/m hr).
1000
Pleasant conditions for travel cease on foggy
and overcast days.
1200
Pleasant conditions for travel cease on clear
sunlit days.
1400
Freezing of human flesh begins, depending
upon the degree of activity, the amount of
solar radiation, and the character of the
skin and circulation.
1600
Travel and life in temporary shelter very
disagreeable.
1900
Conditions reached in the darkness of mid-
winter. Exposed areas of face freeze within
less than a minute for the average
individual. Travel dangerous.
2300
Exposed areas of the face freeze within less
than 1/2 minute for the average individual.
1-7
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