Wind Chill
Calculator
Results
- Wind chill (°C)
- -17.860584
- Wind chill (°F)
- -0.149051
- Apparent temperature drop (°C)
- 7.860584
Weather results
| Wind chill (°C) | -17.860584 |
| Wind chill (°F) | -0.149051 |
| Apparent temperature drop (°C) | 7.860584 |
formula-map diagram
- Wind chill (°C)
- -17.860584
- Wind chill (°F)
- -0.149051
- Apparent temperature drop (°C)
- 7.860584
Weather relationship
Formula
Twc = 13.12 + 0.6215×T − 11.37×v^0.16 + 0.3965×T×v^0.16 (T in °C, v in km/h)= -17.860584344366
Note
This is a simplified model: it applies the published standard formula to the numbers you entered and ignores local terrain, radiation, precipitation type and instrument error. Wind chill is the 2001 NWS/Environment Canada regression, valid at or below 10 °C with wind at or above 4.8 km/h; the heat index is the Rothfusz regression, reliable above about 27 °C; dew point uses the Magnus approximation (a = 17.27, b = 237.7 °C) over liquid water; wet bulb uses Stull's approximation at standard sea-level pressure; pressure and density altitude assume the International Standard Atmosphere and dry air. Do not use these results for aviation, structural or safety decisions without an official forecast or a qualified professional.
More in Weather and climate
See all →Frequently asked questions
What does the wind chill value actually represent?+
Wind chill translates the combined cooling effect of air temperature and wind speed into an equivalent temperature that describes how quickly exposed skin loses heat, expressed on the same scale as still-air temperature so it's easy to compare.
Why does wind make cold air feel colder?+
Skin naturally warms a thin layer of air right against it; wind continuously strips that warmed layer away and replaces it with cold air, forcing the body to keep generating new heat at the surface. Faster wind removes that boundary layer more efficiently, accelerating heat loss.
Is there a point where more wind speed stops making a difference?+
Yes, wind chill formulas generally flatten out at high wind speeds because the boundary layer of warmed air is already being stripped away about as fast as physically possible; beyond a certain speed, additional wind adds relatively little further cooling effect.
Does wind chill apply to objects and vehicles, or only to people?+
No, wind chill specifically models heat loss from exposed human or animal skin. It has no meaningful effect on how cold an inanimate object like a car or a thermometer bulb gets, since those don't generate their own heat the way skin does; they simply equalize to the actual air temperature regardless of wind.
Why do wind chill charts stop applying above a certain air temperature?+
Standard wind chill formulas are only valid at low temperatures, typically at or below about 10°C (50°F), because above that point wind's cooling effect on skin isn't considered dangerous or relevant, so charts simply don't extend the calculation into warmer temperature ranges.