Wind Chill is a measure of relative discomfort due to the combination of cold air temperatures and wind. The faster the wind speed, the faster heat is carried away from the body.
Exposure to low wind chills can be life threatening to both humans and animals alike. However, the only effect wind chill has on inanimate objects is that it shortens the time it takes the object to cool to the actual air temperature (an object cannot be cooled down below air temperature).
The wind-chill temperature equals the actual air temperature when the wind speed is 4 mph or less. At higher wind speeds, the wind-chill temperature is lower than the air temperature and measures the increased cold stress and discomfort associated with wind.
