General
Wind chill calculator.
Uses Environment Canada's own wind chill formula — the Meteorological Service of Canada equation, which is different from the US National Weather Service formula. Enter air temperature and wind speed.
Inputs
Wind chill index
Fill the form and press Calculate.
Why this isn't the US formula
Canada and the United States use genuinely different wind chill equations. Environment Canada's formula, developed by the Meteorological Service of Canada, is calibrated against Canadian research into heat loss from human skin and uses wind speed measured at 10 metres in km/h. The US National Weather Service formula uses different coefficients and imperial units (mph). Plugging the same temperature and wind speed into each produces a different number — this tool applies the Canadian formula only.
The formula
For air temperature at or below 0°C and wind speed of 5 km/h or more:
W = 13.12 + 0.6215×Tair − 11.37×V10m0.16 + 0.3965×Tair×V10m0.16
For air temperature at or below 0°C and wind speed above 0 but under 5 km/h:
W = Tair + [(−1.59 + 0.1345×Tair) / 5] × V10m
Where W is the wind chill index in Celsius, Tair is air temperature in Celsius, and V10m is wind speed at 10 metres in km/h. Above 0°C, or with no wind, Environment Canada does not calculate a wind chill value — the air temperature is what it is, and this calculator shows the air temperature unchanged in that case.
Source, read 29 September 2026 (fetched directly from Environment Canada's own page): climate.weather.gc.ca — Environment and Climate Change Canada glossary, wind chill index entry, which publishes both equations with these exact coefficients.
Frequently asked questions
Why does my phone's weather app show a different wind chill than this?
Some apps and US-sourced weather data use the National Weather Service formula, which is calibrated differently from Environment Canada's. For a Canadian location and a Canadian source, they should be using this formula — if a number looks off, check whether the app pulls from a US data provider.
Why is there no wind chill above 0°C?
Wind chill measures how wind accelerates heat loss below freezing. Environment Canada's formula is only defined for air temperature at or below 0°C; above that, wind doesn't create the same cold-injury risk the index is designed to warn about.
Why does the formula change below 5 km/h wind speed?
The main formula's V0.16 term behaves poorly as wind speed approaches zero, so Environment Canada defines a separate, simpler formula for the 0–5 km/h range that blends smoothly with the main one at 5 km/h.
Is wind chill measured in the same units as temperature?
Yes — the wind chill index is expressed in Celsius, on the same numeric scale as air temperature, even though it isn't itself a temperature. It's a felt-cold index calibrated so the number is directly comparable to how cold a still-air temperature would feel.
Estimate only
This tool applies Environment Canada's published wind chill formula for general information. For official warnings and current conditions, always check Environment Canada's own weather alerts before outdoor exposure in cold conditions.