The Wind Chill Calculator computes the feels-like temperature based on air temperature and wind speed, helping you understand the real sensation of cold weather exposure. It supports both the NWS/Environment Canada standard formula and the legacy Siple formula, with frostbite risk assessment and protection advice.
Before skiing, hiking, or running, calculate wind chill to assess feels-like temperature and decide on gear or schedule adjustments.
Assess frostbite risk for outdoor construction workers in winter to plan work hours and protective measures.
Weather enthusiasts and broadcasters use wind chill to communicate real cold sensation and travel advice.
Schools use wind chill to decide whether to cancel outdoor recess or PE classes for student safety.
The wind chill concept originated from Antarctic explorer Paul Siple's 1945 research, discovering that wind significantly accelerates body heat loss. In 2001, NWS and Environment Canada jointly developed the new wind chill formula based on facial heat loss modeling and modern heat transfer theory. Formula: WC = 13.12 + 0.6215T - 11.37V^0.16 + 0.3965TV^0.16, where T is Celsius temperature and V is wind speed in km/h.
Wind Chill Index measures the combined effect of wind and low temperature on perceived cold. Higher wind speeds accelerate body heat loss, making it feel colder than actual temperature.
The NWS/Environment Canada formula applies when temperature ≤10°C and wind speed ≥4.8km/h. Outside this range, wind chill effect is negligible.
Actual temperature is the thermodynamic air temperature, while wind chill is the equivalent temperature felt in wind. At -5°C with 30km/h wind, wind chill is about -13°C.
Lower wind chill means higher frostbite and hypothermia risk. Below -28°C, exposed skin may frostbite in 10-30 minutes; below -40°C, 5-10 minutes.
The formula uses 1.5-meter height wind speed. Weather station speeds are typically at 10 meters, about 1.5 times higher than surface-level.