Cold or wet weather does not cause a cold, but nobody seems to want to accept this. The is common cold is caused by a virus. These viruses are everywhere and it is difficult to avoid them. When you are exposed to someone who has a cold, you are more likely to get ill yourself, so be careful about close contact and definitely wash your hands. Not getting enough sleep or eating poorly can also reduce your resistance to infection. Remember that antibiotics won’t fight your everyday cold. Antibiotics work only against bacteria. To take care of a cold, rest, eat well, and a little chicken soup couldn’t hurt.

But!

But if that’s true, why do people contract a cold more often in the Winter? Doctors don’t have a certain answer, but according to the New York Times there are a few working theories. Because colds are spread by transferring the virus from one person to another, you need to be in contact with other people. People spend more time indoors during the Winter, and so you often find yourselves 1) around them, and 2) in an enclosed space. If one person gets sick in a household, office, or wherever, there’s a good chance that virus will spread. As you should any time of year, keep your distance from the contagious.

Great list on LifeHacker.