Wind chill is the apparent temperature felt on your exposed skin, which is a function of the air temperature and wind speed together. The Wind Chill does not make "Objects" colder than the air temperature is. The wind chill temperature often called the "Wind Chill Factor" is always lower than the actual air temperature, except at higher temperatures where wind chill is not as important. When the apparent temperature is higher than the air temperature, the heat index is used instead.