This article was written by a registered nurse of something like 10+ years who is also a health writer, which I figure I can trust reliably. The misconception surrounds the idea that the literal coldness of winter causes people to become ill which has some truth to it, but also doesn't. The article explains that the dryness of the winter seasons lowers the bodys defense, for example the mucus in your nose helps keep germs out, and when it is dry out it causes that mucus to dry out as well. Also, the cold temperatures causes people to spend more time indoors where germs are more able to spread due to small, enclosed spaces. However, the facts given by the source aren't really shown to have come from anywhere which makes me question the reliability of the article. it seems like the point is more likely to urge people to wash their hands and sneeze in their elbows than falsify the claim that the cold causes colds. I would say that there aren't enough reliable sources to prove this true or false because it's based on common sense not research.