Wind Chill, Explained — What 'Feels Like' Temperature Really Measures
Wind chill is not a temperature. It's a model of how fast exposed human skin loses heat when wind strips away the thin warm layer of air your body maintains. The thermometer reading doesn't change with wind; the rate you lose heat does — so "10°F, feels like −15°F" means your skin cools as fast as it would on a calm −15°F day.
The thresholds that matter
- Around 0°F wind chill — frostbite possible on exposed skin in about 30 minutes.
- −20°F — frostbite in roughly 10 minutes; the common threshold for Cold Weather Advisories.
- −35°F and below — frostbite in as little as 5 minutes; Extreme Cold Warning territory. School districts and outdoor work shut down on these numbers.
What wind chill does and doesn't affect
It only applies to things that are warmer than the air — people, animals, your house's heat loss rate. Your car's radiator, pipes, and the road surface cannot be chilled below the actual air temperature no matter the wind (though wind makes them reach that temperature faster). And because the formula assumes bare skin, proper layers effectively erase most of the differential — which is the practical takeaway: cover skin, and wind chill mostly stops applying to you.
Cold-weather advisories and warnings appear with the rest of the winter products on our winter storm tracker, each tagged with the states it covers.
FAQ
Is wind chill a real temperature?
No — it's an equivalent: the calm-air temperature at which exposed skin would lose heat at the same rate. Objects can never be cooled below the actual air temperature by wind.
How fast can you get frostbite?
At a wind chill around 0°F, about 30 minutes on exposed skin; at −20°F, about 10 minutes; at −35°F and colder, as little as 5 minutes. Covering skin dramatically extends all of these.
Can pipes freeze because of wind chill?
Wind chill can't take pipes below the air temperature, but wind does make them lose heat faster and reach the air temperature sooner — so wind absolutely increases pipe-freeze risk on a sub-freezing night, just not below the actual temperature.