Calculate the wind chill factor (feels like temperature) based on actual temperature and wind speed. Get frostbite warnings and safety recommendations.
Feels Like
6.2°F
Wind chill temperature
Cold. Dress warmly and limit exposure.
Actual
20°F
Feels Like
6.2°F
Wind makes it feel moderately colder.
| Wind Chill | Frostbite Time | Risk Level |
|---|---|---|
| Above 32°F (0°C) | N/A | Safe |
| 0°F to 32°F (-18°C to 0°C) | Low risk | Caution |
| -20°F to 0°F (-29°C to -18°C) | 30+ minutes | Warning |
| -35°F to -20°F (-37°C to -29°C) | 10-30 minutes | Danger |
| Below -35°F (-37°C) | <10 minutes | Extreme Danger |
| Temp\Wind | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
|---|---|---|---|---|---|---|---|---|
| 40°F | 37 | 34 | 32 | 31 | 29 | 29 | 28 | 27 |
| 30°F | 25 | 21 | 19 | 17 | 16 | 15 | 14 | 13 |
| 20°F | 13 | 9 | 6 | 4 | 3 | 1 | 0 | -1 |
| 10°F | 1 | -3 | -7 | -9 | -11 | -12 | -14 | -15 |
| 0°F | -10 | -16 | -19 | -22 | -24 | -26 | -27 | -29 |
| -10°F | -22 | -28 | -32 | -35 | -37 | -39 | -41 | -43 |
| -20°F | -34 | -41 | -45 | -48 | -51 | -53 | -55 | -57 |
| -30°F | -46 | -53 | -58 | -61 | -64 | -67 | -69 | -71 |
| -40°F | -57 | -65 | -71 | -74 | -78 | -80 | -82 | -84 |
Wind speed in mph, temperatures in °F
⚠️ Take breaks
⚠️ Reduce intensity
⚠️ Frequent warm-up breaks
Wind chill (or wind chill factor) is the perceived decrease in temperature felt by the body due to wind. Moving air accelerates heat loss from exposed skin. A 20°F day with 15 mph wind feels like 6°F on your skin.
The NWS formula: Wind Chill = 35.74 + 0.6215T - 35.75V^0.16 + 0.4275TV^0.16, where T is temperature (°F) and V is wind speed (mph). It's valid when temp ≤50°F and wind ≥3 mph.
Wind chill below 0°F poses frostbite risk within 30 minutes. Below -20°F: frostbite in 10-30 min. Below -35°F: frostbite in 5-10 min. Below -50°F: frostbite in under 5 minutes. Cover all exposed skin!
Wind chill only affects warm-blooded creatures. Objects cool to air temperature regardless of wind. A car won't get colder than the air temperature no matter how windy. Wind just helps objects reach air temperature faster.
Layer clothing with moisture-wicking base, insulating middle, wind-blocking outer. Cover extremities (hat, gloves, face mask). Limit exposure time. Stay dry - wet clothing increases heat loss dramatically.
Feels Like
6.2°F
Wind chill temperature
Cold. Dress warmly and limit exposure.