This turns into the myth that the cold weather is the cause of illness. This article means that colds are actually more prevalent in winter due to other factors, including the dry air, people being indoors more with close contact, and lower levels of vitamin D. These conditions, it is evident that viruses would have the most opportunities for easy spread. Another article from Northwestern Medicine corroborates this notion, further cementing the fact that it is not the cold that makes people sick, but how winter affects our bodies and behaviors.
Source: Northwestern Medicine