wind chill

#winter

Wind blows away the head radiating from our skin, lowering its temperature. Based on sustained wind, not gusts.

W i n d C h i l l = 35.74 + (0.6215 \times T) - (35.75 \times W i n d^{0.16}) + (0.4275 \times T \times W i n d^{0.16})

Where $W i n d$ is the speed in miles per hour and $T$ is the temperature in fahrenheit^[1]

Wind chill dramatically increases the chance of frostbite and hypothermia:

There's also a wind chill calculator provided by the National Weather Service.