Windchill decreases the feel of the temperature based on the wind speed. The faster the wind the colder the temperature is outside. The wind does not actually make it colder, it draws heat from the body which makes it seem colder to any living thing. The wind chill can be -30 and water would not freeze. (This chart shows the relation between
the actual temp. and the windchill factor.)
the actual temp. and the windchill factor.)