Wind Chill Calculator
Calculate wind chill from temperature and wind speed using the official NWS formula. Free wind chill calculator with Fahrenheit and Celsius for weather safety.
About This Calculator
Our wind chill calculator helps you determine the perceived temperature — how cold it actually feels on exposed skin — based on the actual air temperature and wind speed. Whether you are planning outdoor activities, dressing for cold weather, or assessing frostbite risk, this tool provides accurate wind chill values using the official National Weather Service (NWS) formula used by meteorologists worldwide.
Wind chill is calculated using the NWS standard formula. In Fahrenheit and miles per hour: T_wc = 35.74 + 0.6215 × T_a - 35.75 × V^0.16 + 0.4275 × T_a × V^0.16. In Celsius and kilometers per hour: T_wc = 13.12 + 0.6215 × T_a - 11.37 × V^0.16 + 0.3965 × T_a × V^0.16. This formula has been validated through extensive research on human heat loss and is the standard used by weather services in the US, UK, Canada, and other countries.
Regional Notes
United States: The NWS reports wind chill when the temperature is at or below 50°F and wind speeds exceed 3 mph. Wind chill advisories are issued when values drop below -20°F, and wind chill warnings when below -35°F.
United Kingdom: The UK Met Office uses the same NWS formula but typically reports wind chill in Celsius. The UK experiences milder winters, but wind chill can still be significant, especially in northern Scotland and coastal areas exposed to strong winds.
India: While India has a tropical climate, wind chill affects higher-altitude regions like the Himalayas, Kashmir, Ladakh, and Himachal Pradesh during winter months. Trekkers and mountaineers should account for wind chill when planning expeditions above 3,000 meters.
Understanding Wind Chill Risk Levels
Wind chill values below -18°F (-28°C) pose a risk of frostbite within 30 minutes. At wind chill values below -40°F (-40°C), frostbite can occur in under 5 minutes. Hypothermia becomes a concern when wind chill causes body heat loss to exceed heat production. Always dress in layers, cover exposed skin, and limit time outdoors during extreme wind chill conditions.
Frequently Asked Questions
What is wind chill?
Wind chill is how cold it feels on exposed skin due to the combination of air temperature and wind speed. The faster the wind blows, the faster heat is carried away from the body, making it feel colder than the actual air temperature.
How is wind chill calculated?
Wind chill is calculated using the National Weather Service (NWS) formula. In Fahrenheit and mph: Twc = 35.74 + 0.6215×T - 35.75×V^0.16 + 0.4275×T×V^0.16. In Celsius and km/h: Twc = 13.12 + 0.6215×T - 11.37×V^0.16 + 0.3965×T×V^0.16.
At what wind chill temperature does frostbite occur?
Frostbite can occur when the wind chill temperature drops below -27°F (-33°C). At this level, exposed skin can freeze within 30 minutes. The risk increases as the wind chill drops further, with frostbite possible in under 5 minutes at -50°F (-45°C) or below.
What is the difference between wind chill and actual temperature?
Actual temperature is the true air temperature measured by a thermometer. Wind chill is the perceived temperature that accounts for heat loss from exposed skin due to wind. Wind chill is always lower than or equal to the actual temperature when wind is present.
Does wind chill affect objects like cars or pipes?
No, wind chill only affects living beings that generate heat. It describes how fast heat is lost from the body. Inanimate objects like cars, pipes, and buildings will cool to the actual air temperature, not the wind chill temperature.
Can wind chill be calculated below 50°F (10°C)?
Yes, the NWS wind chill formula is designed for temperatures at or below 50°F (10°C) and wind speeds above 3 mph (4.8 km/h). Above these thresholds, the cooling effect of wind on the human body is minimal and wind chill is not typically reported.
How should I dress for low wind chill temperatures?
For low wind chill temperatures, wear multiple layers of loose-fitting clothing, a wind-resistant outer layer, a hat or hood, gloves or mittens, a scarf or face mask to cover exposed skin, and insulated waterproof boots. Limit time outdoors and watch for signs of frostbite and hypothermia.
What are the health risks of extreme wind chill?
Extreme wind chill poses two main health risks: frostbite (freezing of skin and underlying tissues) and hypothermia (dangerously low body core temperature). Early signs of frostbite include numbness and pale or waxy skin. Hypothermia symptoms include intense shivering, confusion, and drowsiness.