Wind chill - Minutes to Frostbite 

The following are approximate values
Temperature (°C)	-15	-20	-25	-30	-35	-40	-45	-50	
Wind (km/h)									
10  	*	*	22	15	10	8	7	2	
20  	*	30	14	10	5	4	3	2	
30  	*	18	11	8	5	2	2	1	
40  	42	14	9	5	5	2	2	1	
50  	27	12	8	5	2	2	2	1	
60  	22	10	7	5	2	2	2	1	
70  	18	9	5	4	2	2	2	1	
80  	16	8	5	4	2	2	2	1	
•	= Frostbite unlikely 
The wind speed, in km/h, is at the standard anemometer height of 10 metres 
(as reported in weather observations).

Frostbite possible in 2 minutes or less		
Frostbite possible in 3 to 5 minutes		
Frostbite possible in 6 to 10 minutes