Wind Chill Calculator
Calculate wind chill temperature and assess cold weather risks
Calculate Wind Chill
The actual air temperature
Wind speed at 5 feet above ground
Wind Chill Results
✅ Little danger with proper clothing. Normal outdoor activities possible.
Calculation Details
Formula: NWS Wind Chill Formula (2001)
Temperature: 0.0°C → 32.0°F
Wind Speed: 10.0 km/h → 6.2 mph
Example Calculation
Cold Winter Day
Conditions: Air temperature: 0°C (32°F)
Wind Speed: 20 km/h (12.4 mph)
Calculation: Using NWS formula
Wind Chill = 35.74 + 0.6215×32 - 35.75×(12.4)^0.16 + 0.4275×32×(12.4)^0.16
Result
Wind Chill = 22.6°F (-5.2°C)
Feels Like: 9.4°F (5.2°C) colder than actual temperature
Risk Level: Low to moderate - dress warmly
Wind Chill Risk Scale
Frostbite Timeline
30+ minutes
Wind chill -10°C to -28°C
10-30 minutes
Wind chill -28°C to -40°C
5-10 minutes
Wind chill -40°C to -48°C
2-5 minutes
Wind chill below -48°C
Cold Weather Safety
Dress in layers to trap warm air
Cover all exposed skin - hands, face, ears
Limit time outdoors when wind chill is severe
Seek shelter if you feel numbness or tingling
Stay hydrated and avoid alcohol outdoors
Understanding Wind Chill
What is Wind Chill?
Wind chill is the perceived decrease in air temperature felt by the body due to the flow of air. When wind blows across your skin, it removes the thin layer of warm air your body creates, making you feel colder than the actual air temperature.
Heat Loss Mechanisms
- •Convection: Wind removes warm air from your skin
- •Conduction: Heat transfer through direct contact
- •Radiation: Heat emission from your body
NWS Wind Chill Formula
Twc = 35.74 + 0.6215×T - 35.75×V0.16 + 0.4275×T×V0.16
- Twc: Wind chill temperature (°F)
- T: Air temperature (°F)
- V: Wind speed (mph)
Note: Wind chill is only calculated when air temperature is ≤50°F (10°C) and wind speed is ≥3 mph (4.8 km/h). Below these thresholds, wind chill equals air temperature.