Why are you more prone to getting the flu/a cold when the weather is cold?

You aren't...: Exposure to cold weather, in and of itself, doesn't make you more prone to the flu. To be sure, more cold/flu infections do occur in the winter months, but it's thought that this is more related to opening of schools, staying indoors in close contact with others (who don't wash their hands!), and relatively lower humidity that can help some viruses out. So wash your hands and don't be afraid!

Viral infections: It's not the cold weather that encourages spread of viral infections, it is the fact that people tend to remain mostly indoors when it's cold, and therefore have more contact between each other and with other surfaces such as doorknobs and bathrooms. That is why frequent and thorough handwashing is the best preventative of colds and flu that we know of. Flu shots help too! Good luck.

Spending time indoor: Cold weather won't cause the cold/flu; however, ti's the consequence of cold weather that does. Most of us tend to stand indoors when temperatures drop and we tend to aggregate around each other. We then proceed to cough/sneeze and thereby spread more virus than otherwise happens during summer time. So take your flu shot, cover your mouth when you cough and wash your hands!