Wind Chill Calculator

Calculate the wind chill temperature using the official NWS formula. Assess frostbite risk based on conditions.

Wind chill translates cold, windy conditions into the temperature exposed skin actually experiences, which can be dramatically colder than the thermometer reading alone. This calculator uses the official U.S. National Weather Service wind chill formula, which applies when the air temperature is 50°F or colder and wind speed is at least 3 mph -- calm air or mild temperatures don't strip heat from skin fast enough for wind chill to meaningfully differ from the actual temperature, so outside those conditions the feels-like value simply matches the actual temperature. Within its valid range, the formula combines the actual temperature with wind speed raised to a fractional power (0.16), which reflects that wind's cooling effect grows quickly at low speeds but yields diminishing additional cooling as speed keeps climbing -- doubling the wind speed from 10 to 20 mph does not double the cooling effect. The result is reported as a temperature drop (how much colder it feels versus the actual reading) alongside a frostbite risk category, since wind chill's real-world purpose is warning how quickly exposed skin can suffer frostbite: the colder the feels-like temperature drops, the faster tissue damage can occur, ranging from low risk near freezing down to frostbite in under five minutes at the most extreme wind chill values. This is a standardized meteorological estimate, not a personal safety guarantee -- individual cold tolerance, wind gusts, wet skin, and clothing all change how quickly cold actually affects a given person.