There's supposedly a scientific basis for wind chill. The 'official' wind chill table was updated just a couple years ago to be more accurate. There's no arguing the fact that, if you expose bare skin to X degrees with wind averaging Y MPH, it'll take the same amount of time for frostbite to occur as if it had been Z degrees with no wind. The only argument is with the numbers. The phenomenon is real.
If you've ever had frostbite, you know it's serious business. Don't make me post pictures. :-)
Wind chill, heat index - stop the insanity!