Wind Chill Calculation Chart - Metric
| wind speed (km/h)* |
Air temperature in °C | |||||||||||
| 5 | 0 | -5 | -10 | -15 | -20 | -25 | -30 | -35 | -40 | -45 | -50 | |
| 5 | 4 | -2 | -7 | -13 | -19 | -24 | -30 | -36 | -41 | -47 | -53 | -58 |
| 10 | 3 | -3 | -9 | -15 | -21 | -27 | -33 | -39 | -45 | -51 | -57 | -63 |
| 15 | 2 | -4 | -11 | -17 | -23 | -29 | -35 | -41 | -48 | -54 | -60 | -66 |
| 20 | 1 | -5 | -12 | -18 | -24 | -31 | -37 | -43 | -49 | -56 | -62 | -68 |
| 25 | 1 | -6 | -12 | -19 | -25 | -32 | -38 | -45 | -51 | -57 | -64 | -70 |
| 30 | 0 | -7 | -13 | -20 | -26 | -33 | -37 | -46 | -52 | -59 | -65 | -72 |
| 35 | 0 | -7 | -14 | -20 | -27 | -33 | -40 | -47 | -53 | -60 | -66 | -73 |
| 40 | -1 | -7 | -14 | -21 | -27 | -34 | -41 | -48 | -54 | -61 | -68 | -75 |
| 45 | -1 | -8 | -15 | -21 | -28 | -35 | -42 | -48 | -55 | -62 | -69 | -75 |
| 50 | -1 | -8 | -15 | -22 | -29 | -35 | -42 | -49 | -56 | -63 | -70 | -76 |
| 55 | -2 | -9 | -15 | -22 | -29 | -36 | -43 | -50 | -57 | -63 | -70 | -77 |
| 60 | -2 | -9 | -16 | -23 | -30 | -37 | -43 | -50 | -57 | -64 | -71 | -78 |
| 65 | -2 | -9 | -16 | -23 | -30 | -37 | -44 | -51 | -58 | -65 | -72 | -79 |
| 70 | -2 | -9 | -16 | -23 | -30 | -37 | -44 | -51 | -59 | -66 | -73 | -80 |
| 75 | -3 | -10 | -17- | -24 | -31 | -38 | -45 | -52 | -59 | -66 | -73 | -80 |
| 80 | -3 | -10 | -17 | -24 | -31 | -38 | -45 | -52 | -60 | -67 | -74 | -81 |
*Observed wind speed at 10m elevation, in km/h.
| Approximate Threshold: | ||
| Risk of frostbite in prolonged exposure: | -25°C | |
| Frostbite possible in 10 minutes: | -35°C | Warm skin, suddenly exposed. Shorter time if skin is cool at the start. |
| Frostbite possible in less than 2 minutes: | -60°C | Warm skin, suddenly exposed. Shorter time if skin is cool at the start. |
There is an old saying: "if your feet are cold, cover your head." Body heat rises and escapes from the neck and crown of the head. A knitted toque or balaclava worn under a helmet is a practical answer. Buy a helmet that is large enough to allow for headgear.
