Wind chill

Wind chill is the decrease in air temperature felt when wind touches the body.

A chart of wind chill values and how fast it is to get frostbite when outside in such temperatures[1].

Wind chill numbers are always lower than the actual outside temperature. When the temperature felt outside is higher than the real temperature, the heat index is used.

References
  1. "NWS Windchill Temperature". National Oceanic and Atmospheric Administration. Retrieved 4 August 2015.
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