Consult the Windchill Chart below to avoid severe cold—and frostbite.
As the wind speed increases, the air temperature against your body falls. The combination of cold temperature and high wind creates such a severe cooling effect that your flesh can actually freeze.
Check out the Beaufort Wind Scale  to learn how to judge the speed of the wind.
Then, check out this chart below to see how cold you'll feel! Click to expand U.S. Windchill Chart  (PDF).