Science & Engineering
Wind Chill Calculator
How cold it actually feels with wind speed factored in.
The wind chill index reflects perceived temperature when wind accelerates heat loss from exposed skin. Uses the official Environment Canada formula.
Feels Like
-18.8 C
- warning
- Cold but safe
- diff
- 8.8 C colder due to wind
Formula and method
WC = 13.12 + 0.6215T - 11.37V^0.16 + 0.3965TV^0.16
Environment Canada / NWS formula valid for T <= 10C and V >= 4.8 km/h.
Worked examples
-10C with 25 km/h wind
- Air Temperature (C):
- -10
- Wind Speed (km/h):
- 25
Feels Like: -18.8 C
Assumptions and limits
- Exposed skin
This tool provides an educational estimate. Rules, rates and personal circumstances can change the answer. Review the assumptions before relying on a result. Report a correction.
Common mistakes to avoid
- Using mph in a metric formula.
Frequently asked questions
Frostbite?
Under -27 wind chill, exposed skin can freeze within 30 minutes.
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