Wind Chill Reference Chart (°F)

Temp\Wind5 mph1015203040
40°F363432302827
30°F252119171513
20°F139641-1
10°F1-4-7-9-12-15
0°F-11-16-19-22-26-29
-10°F-22-28-32-35-39-43
-20°F-34-41-45-48-53-57

Frostbite Risk Levels

Wind ChillRiskFrostbite Time
Above 0°FLowUnlikely with proper clothing
0°F to -10°FModerate30+ minutes on exposed skin
-10°F to -25°FHigh10-30 minutes
-25°F to -45°FVery High5-10 minutes
Below -45°FExtremeUnder 5 minutes

The NWS Wind Chill Formula