http://www.womansday.com/health-fitness/10-winter-health-myths-exposed-115114#slide-1

Myth #1: You can catch a cold by being out in the elements too long.

You’ve probably heard the old warning that going outside in chilly weather, and staying there too long, can make you “catch” a cold. Not true, says D.J. Verret, MD, an otolaryngologist in Dallas. “Going outside—with or without a wet head—is one of the best things you can do to prevent catching a cold. Actually being cold has nothing to do with your risk of catching a cold. Colds are caused by viruses or bacteria which are more often spread in the winter because of close contact from everyone being indoors.” That’s right, spending time outdoors can make you less susceptible to those nasty germs