Wind chill calculator

Wind chill is how cold exposed skin feels when wind strips away the thin layer of warm air around it. The current formula is defined only at 10°C or below with wind above about 5 km/h.

The range limit matters and is why this reports whether you are inside it. Below 5 km/h there is no meaningful chill because the boundary layer is not being disturbed, and above 10°C the formula was never fitted. The 2001 revision that most countries now use was based on measurements of volunteers in a wind tunnel with sensors on their faces, replacing a 1945 formula derived from how fast water froze in a plastic cylinder — which overstated the effect considerably. One thing wind chill does not do: it does not lower the temperature of objects. Your car will not freeze faster because of wind chill; only things generating their own heat, like you, feel it.