The air temperature we FEEL that is corrected for the influence of wind speed. In MOST cases, the wind chill temperature will be lower than the actual temperature, but in certain cases of high temperature and humidity, wind will actually make the perceived temperature hotter than the actual temperature! Above a certain wind speed, additional wind will not lower the wind chill value.
the rate at which a man or object cools to the ambient temperature; wind increases the rate of cooling and adds to the risk of frostbite, hypothermia, and other cold-weather injuries
Increased wind speeds accelerate heat loss from exposed skin. No specific rules exist for determining when wind chill becomes dangerous. As a general rule, the threshold for potentially dangerous wind chill conditions is about -20 F. [Go to source