Table IX-5.

Physical effects by cold chill index and equivalent temperature

Cold chill index	Equivalent air temperature (°C)	Physical effects
1,000	−14	Very cold
1,200	−22	Extremely cold
1,400~1,550	−30~−38	Frostbite of exposed skin in one hour
1,700~1,900	−45~−53	Dangerous outside activity such as walking, frostbite occurs on exposed part of the face in one minute
2,000~2,300	−61~−69	Frostbite occurs on exposed part of the face in 30 seconds