What Is Wind Chill?
Wind chill is what the temperature feels like when wind speed is factored in. Wind increases heat loss from exposed skin, making the effective temperature much colder than the actual air temperature.
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Quick Reference Wind Chill Chart
Wind Chill Table (Temperature °F vs. Wind Speed mph)
| Temp | 5 mph | 10 mph | 15 mph | 20 mph | 25 mph | 30 mph | 35 mph | 40 mph |
|---|---|---|---|---|---|---|---|---|
| 40°F | 36 | 34 | 32 | 30 | 29 | 28 | 28 | 27 |
| 35°F | 31 | 27 | 25 | 24 | 23 | 22 | 21 | 20 |
| 30°F | 25 | 21 | 19 | 17 | 16 | 15 | 14 | 13 |
| 25°F | 19 | 15 | 13 | 11 | 9 | 8 | 7 | 6 |
| 20°F | 13 | 9 | 6 | 4 | 3 | 1 | 0 | -1 |
| 15°F | 7 | 3 | 0 | -2 | -4 | -5 | -7 | -8 |
| 10°F | 1 | -4 | -7 | -9 | -11 | -12 | -14 | -15 |
| 5°F | -5 | -10 | -13 | -15 | -17 | -19 | -21 | -22 |
| 0°F | -11 | -16 | -19 | -22 | -24 | -26 | -27 | -29 |
| -5°F | -16 | -22 | -26 | -29 | -31 | -33 | -34 | -36 |
| -10°F | -22 | -28 | -32 | -35 | -37 | -39 | -41 | -43 |
| -15°F | -28 | -35 | -39 | -42 | -44 | -46 | -48 | -50 |
| -20°F | -34 | -41 | -45 | -48 | -51 | -53 | -55 | -57 |
Frostbite Risk Levels
Time to Frostbite by Wind Chill
| Wind Chill | Risk Level | Frostbite Time |
|---|---|---|
| 0°F to -10°F | Moderate | 30 minutes exposed skin |
| -10°F to -25°F | High | 10-30 minutes |
| -25°F to -40°F | Very High | 5-10 minutes |
| -40°F to -55°F | Extreme | Under 5 minutes |
| Below -55°F | Dangerous | Under 2 minutes |
Cold Risk Categories
Danger Levels
| Wind Chill | Category | Required Actions |
|---|---|---|
| Above 35°F | Low | Normal cold weather precautions |
| 35°F to 20°F | Moderate | Layer clothing, limit exposed skin |
| 20°F to 0°F | Cold | Significant protection required |
| 0°F to -20°F | Very Cold | Minimize exposure, full coverage |
| Below -20°F | Extreme | Limit outdoor work, emergency conditions |
Exposure Limits by Wind Chill
Maximum Continuous Exposure Time
- Monitor for discomfort and cold symptoms
- Regular warm-up breaks recommended
- Warm-up breaks: 10-15 minutes every 1-2 hours
- Full coverage of all exposed skin
- Warm-up breaks: 15-20 minutes every hour
- Monitor for frostbite continuously
- Work periods: Maximum 1 hour
- Warm-up breaks: 20+ minutes minimum
- Buddy system mandatory
Body Parts at Risk
Frostbite Priority Areas
- Toes
- Ears
- Nose
- Cheeks
- Chin
- Back of hands
- Any exposed skin
Warning Signs
Frostnip (Early Warning)
- Numbness
- Tingling
- White or pale skin
- Skin feels hard or waxy
Frostbite (Emergency)
- Hard, waxy-looking skin
- Blistering after rewarming
- Skin turns blue or black
- Loss of sensation
Hypothermia (Life-Threatening)
- Intense shivering (then shivering may stop)
- Confusion, memory loss
- Slurred speech
- Drowsiness
- Fumbling hands
Cold Weather Work Checklist
Before Work
- [ ] Check forecast and wind chill
- [ ] Plan for breaks in warm area
- [ ] Dress in proper layers
- [ ] Ensure all skin is covered
- [ ] Confirm communication methods work
- [ ] Review emergency plan
During Work
- [ ] Take scheduled warm-up breaks
- [ ] Monitor extremities for numbness
- [ ] Stay dry (wet clothing loses insulation)
- [ ] Keep moving to generate heat
- [ ] Watch coworkers for symptoms
- [ ] Hydrate (cold reduces thirst sensation)
Signs to Stop Work
- [ ] Uncontrollable shivering
- [ ] Numbness that doesn't improve with movement
- [ ] Difficulty using hands
- [ ] Confusion or drowsiness
- [ ] Any frostbite symptoms
Clothing Requirements by Wind Chill
Wind Chill Above 20°F
- Layered clothing
- Hat
- Gloves
- Wind-resistant outer layer
Wind Chill 0°F to 20°F
- Multiple insulating layers
- Insulated hat covering ears
- Insulated gloves or mittens
- Face protection if extended exposure
- Insulated, waterproof boots
Wind Chill Below 0°F
- Maximum insulation layers
- Balaclava or face mask
- Heavy mittens (warmer than gloves)
- Insulated boots with extra socks
- No exposed skin
- Goggles if working in wind
Quick Mobile Reference
WIND CHILL QUICK GUIDE
Above 20°F = Moderate - Normal cold precautions 0-20°F = Cold - Full protection required -20 to 0°F = Very Cold - Minimize exposure Below -20°F = Extreme - Essential work only
FROSTBITE WARNING SIGNS
- Numbness
- White or waxy skin
- Hard feeling skin
- Tingling or stinging
- Can't feel fingers/toes
- Shivering won't stop
- Skin turns white
- Difficulty using hands
- Confusion
- Slurred speech
- Shivering stops (dangerous sign)
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Special Considerations
Working Around Water
- Wet clothing dramatically increases cold injury risk
- Hypothermia can occur in water above 50°F
- Have dry clothing available
Equipment Operation
- Cold metal conducts heat rapidly from hands
- Use insulated handles or heavy gloves
- Equipment may operate differently in cold
- Batteries die faster in cold
Vehicle Safety
- Keep emergency supplies in vehicle
- Ensure heater works before going out
- Fuel tank at least half full
- Tell someone your route and return time
