Wind chill is based on the rate of heat loss from exposed skin caused by wind and cold. As the wind increases, it draws heat from the body, driving down skin temperature and eventually the internal body temperature. Therefore, the wind makes it FEEL much colder.

What affects windchill?

Wind chill affects every and all objects, until it doesn't. It stops having an effect when the object is the same temperature as the actual air temperature. Any warm heat sources like your body or your home, that are trying to maintain a warm temperature in a cold environment, will all be affected by wind chill.

Does wind chill really matter?

No. Your skin temperature cannot drop below the actual air temperature. The coldest your uncovered face could get would be 15 degrees F whether the wind is calm or howling at 40 mph. ... Wind chill is a mathematically derived number that approximates how cold your skin feels—not how cold your skin actually is.