Wind Chill Calculator
Calculate the wind chill temperature using the National Weather Service formula.
Cold
At 12.6°F it feels cold, but this is outside the range where frostbite is an immediate concern.
Valid for temperatures at or below 50°F and wind speeds of 3+ mph.
About the Wind Chill Calculator
This calculator works out wind chill — how much colder moving air makes cold weather actually feel on exposed skin — using the official National Weather Service formula, from just an air temperature and wind speed.
It's checked before heading outside in winter weather: deciding how many layers a cold, windy commute actually calls for, judging frostbite risk before outdoor work or sports, or just understanding why a forecast's "feels like" temperature reads so much colder than the actual air temperature.
Wind strips away the thin layer of warmed air that naturally clings to skin, which is why the same air temperature can feel dramatically colder on a windy day than a still one — this calculator quantifies exactly how much colder.
How it’s calculated
The National Weather Service wind chill formula combines air temperature and wind speed (raised to the 0.16 power, reflecting that the cooling effect of wind increases quickly at first but levels off at higher speeds) into a single "feels like" temperature. It's only valid for temperatures at or below 50°F and wind speeds of 3 mph or more — outside that range, wind chill isn't a meaningful or accurate measure.
The frostbite risk zones shown are based on NWS guidance for how quickly frostbite can set in on exposed skin at a given wind chill value — the colder the reading, the less time it takes for frostbite risk to become significant.
Frequently asked questions
How fast can frostbite occur in extreme wind chill?
At wind chills in the extreme range (around -35°F or colder), frostbite on exposed skin can occur in under 5 minutes according to NWS guidance — which is why extreme wind chill warnings are taken seriously for anyone spending time outdoors.
Why doesn't wind chill apply above 50°F?
The wind chill formula specifically models how wind accelerates heat loss from skin in cold conditions — above 50°F, the body isn't losing heat fast enough for wind to meaningfully change the perceived temperature the same way, so the NWS formula isn't calibrated for that range.
Does wind chill affect inanimate objects, like car engines or pipes?
No — wind chill specifically measures how cold moving air feels on living skin due to accelerated heat loss from a body generating its own warmth. Non-living objects cool to the actual air temperature regardless of wind, not to the wind chill value.
What wind speed should I use if forecasts show gusts and sustained wind separately?
Sustained wind speed is the standard input for wind chill calculations, since it reflects ongoing conditions rather than brief gusts — using gust speed would overstate the wind chill for most of the time you're actually outside.
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