Wind Chill Activity Planner
Compare air temperature with an applicable wind-chill estimate.
Your cold conditions inputs
Wind chill describes a model of exposed-skin cooling, not a measured object temperature.
Load a location forecast optional
Manual example inputs work without a connection. Forecasts need a licensed location-data key set by the administrator.
Weather: Open-MeteoAir quality: CAMS. Place names: GeoNames. Pollen forecasts cover Europe during the supported season.
Cold conditions report
-17.86 °C · wind-chill index
Wind-chill formula applied
Full result table
| Scenario wind km/h | °C | Scope |
|---|---|---|
| 5 | -12.933964 | Wind-chill model |
| 10 | -15.260819 | Wind-chill model |
| 20 | -17.860584 | Wind-chill model |
| 40 | -20.765269 | Wind-chill model |
| 60 | -22.619869 | Wind-chill model |
Wind chill describes a model of exposed-skin cooling, not a measured object temperature. No frostbite countdown, clothing prescription or guaranteed safe exposure time is produced. Wind reference height and local shelter affect interpretation.
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How to use Wind Chill Activity Planner
- Compare air temperature with an applicable wind-chill estimate.
- The model is scoped to air temperatures at or below 10°C and winds above 4.8 km/h.
- The comparison table holds air temperature fixed and changes wind speed within the model’s range.
Worked example
At −10°C and 20 km/h wind, the model gives approximately −17.86°C wind chill. A warm-weather input is not forced through the cold-weather formula.
Formula, accuracy & limitations
For T ≤10°C and wind >4.8 km/h: wind chill °C = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16. Outside those conditions the page reports air temperature and says the formula is not applied.
Wind chill describes a model of exposed-skin cooling, not a measured object temperature. No frostbite countdown, clothing prescription or guaranteed safe exposure time is produced. Wind reference height and local shelter affect interpretation.
The primary result is rounded to two decimal places. Calculation tables show up to four and supporting metrics up to six. Very small nonzero values use scientific notation. Display rounding is not fed back into the arithmetic.
Official source and method context ↗Check air temperature and wind together
Compare air temperature with an applicable wind-chill estimate. Enter Celsius and kilometres per hour or load a supported weather forecast. A sheltered point and an exposed weather-station wind reading can differ, so the supplied number is a scenario input rather than a measurement at every location.
Know when the formula is inactive
The model is scoped to air temperatures at or below 10°C and winds above 4.8 km/h. When those conditions are absent, the result clearly reports the air temperature and marks the wind-chill calculation as not applied. It does not return a misleading cold-weather value from an unsuitable input.
Read the wind comparison
The comparison table holds air temperature fixed and changes wind speed within the model’s range. It explains numerical sensitivity without claiming how long a person can remain outside. The values are labelled Celsius and are not confused with kilometres per hour on a shared chart scale.
Keep protection decisions outside the arithmetic
The worksheet cannot know clothing, wetness, circulation, shelter or the duration and intensity of an activity. It therefore provides no frostbite timer or personal clearance. Follow local alerts and appropriate cold-weather precautions instead of interpreting a relative comparison as a safe-exposure guarantee.
Frequently asked questions
Does wind chill cool a parked object below air temperature?
This exposed-skin cooling model does not predict that an unheated object becomes colder than the surrounding air.
Why is the model sometimes not applied?
The supplied temperature or wind falls outside the stated formula conditions.
Can this calculate frostbite time?
No individual injury time is calculated.
Are loaded winds measured at my face?
Provider winds have their own reference height and spatial resolution; they are not a measurement at your exact position.
