Wind Chill Calculation Chart

**Wind chill for temperatures from +5 to -20°C**
T_air (°C) V₁₀ (km/h)	5	0	-5	-10	-15	-20
5	4	-2	-7	-13	-19	-24
10	3	-3	-9	-15	-21	-27
15	2	-4	-11	-17	-23	-29
20	1	-5	-12	-18	-24	-30
25	1	-6	-12	-19	-25	-32
30	0	-6	-13	-20	-26	-33
35	0	-7	-14	-20	-27	-33
40	-1	-7	-14	-21	-27	-34
45	-1	-8	-15	-21	-28	-35
50	-1	-8	-15	-22	-29	-35
55	-2	-8	-15	-22	-29	-36
60	-2	-9	-16	-23	-30	-36
65	-2	-9	-16	-23	-30	-37
70	-2	-9	-16	-23	-30	-37
75	-3	-10	-17	-24	-31	-38
80	-3	-10	-17	-24	-31	-38

**Wind chill for temperatures from -25 to -50°C**
T_air (°C) V₁₀ (km/h)	-25	-30	-35	-40	-45	-50
5	-30	-36	-41	-47	-53	-58
10	-33	-39	-45	-51	-57	-63
15	-35	-41	-48	-54	-60	-66
20	-37	-43	-49	-56	-62	-68
25	-38	-44	-51	-57	-64	-70
30	-39	-46	-52	-59	-65	-72
35	-40	-47	-53	-60	-66	-73
40	-41	-48	-54	-61	-68	-74
45	-42	-48	-55	-62	-69	-75
50	-42	-49	-56	-63	-69	-76
55	-43	-50	-57	-63	-70	-77
60	-43	-50	-57	-64	-71	-78
65	-44	-51	-58	-65	-72	-79
70	-44	-51	-58	-65	-72	-80
75	-45	-52	-59	-66	-73	-80
80	-45	-52	-60	-67	-74	-81

where
T_air = Actual Air Temperature in °C
V₁₀ = Wind Speed at 10 metres in km/h (as reported in weather observations)

Notes:

1. For a given combination of temperature and wind speed, the wind chill index corresponds roughly to the temperature that one would feel in a very light wind. For example, a temperature of -25°C and a wind speed of 20 km/h give a wind chill index of -37. This means that, with a wind of 20 km/h and a temperature of -25°C, one would feel as if it were -37°C in a very light wind.

2. Wind chill does not affect objects and does not lower the actual temperature. It only describe how a human being would feel in the wind at the ambient temperature.

3. The wind chill index does not take into account the effect of sunshine. Bright sunshine may reduce the effect of wind chill (make it feel warmer) by 6 to 10 units.

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Frostbite Guide

Low risk of frostbite for most people

Increasing risk of frostbite for most people within 30 minutes of exposure

High risk for most people in 5 to 10 minutes of exposure

High risk for most people in 2 to 5 minutes of exposure

High risk for most people in 2 minutes of exposure or less

Meteorological Service of Canada - Environment Canada - Government of Canada

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