Free wind chill calculator using the NWS formula. Calculate the apparent temperature based on air temperature and wind speed instantly.
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Wind chill tells you how cold it actually feels when wind is factored in with the air temperature. Wind increases the rate of heat loss from your body, making it feel colder than the actual temperature. Our calculator uses the official NWS wind chill formula.
Wind chill, also known as wind chill temperature or apparent temperature, combines air temperature and wind speed to determine how cold it feels to the human body. Wind accelerates heat loss from exposed skin, making cold temperatures feel even colder. This calculator uses the official NWS and Environment Canada Wind Chill Temperature index adopted in 2001, valid at or below 50°F (10°C) with wind above 3 mph (4.8 km/h).
NWS Wind Chill Formula
Skiers, snowboarders, and ice skaters monitor wind chill for safety.
Construction and utility workers use wind chill for cold stress protocols.
Schools monitor wind chill for outdoor recess and bus stop safety.
Determine safe outdoor time limits for pets in winter.
Know when exposed skin is at risk of frostbite.
Plan outdoor activities safely in cold weather.
Protect vulnerable individuals from hypothermia.
A wind chill of -20°F (-29°C) or lower is dangerous. Frostbite can occur on exposed skin in 10-30 minutes. Below -40°F/°C, frostbite can occur in under 5 minutes.
Your body constantly warms a thin layer of air next to your skin. Wind blows this warm air away, forcing your body to work harder to stay warm. Faster wind removes heat more quickly.
Wind chill is calculated when temperatures are 50°F (10°C) or below and wind speeds are above 3 mph. Above these thresholds, wind chill roughly equals the air temperature.
No, wind chill only affects living things that generate heat. Objects like cars cool to the air temperature regardless of wind, though they may reach that temperature faster in wind.