Wind Chill Calculator

How wind chill and heat index are calculated

Wind chill uses the NWS/Environment Canada formula valid for temperatures at or below 10°C (50°F) and wind speeds above 4.8 km/h (3 mph). It accounts for the rate at which exposed skin loses heat to moving air. Heat index uses the Rothfusz regression formula valid for temperatures above 27°C (80°F) and relative humidity above 40% — it models how humidity reduces the body's ability to cool itself through sweating.

For unit conversion, try Celsius to Fahrenheit or Temperature Converter.