Why do people tend to get sick in the wintertime and not the summer?
But why do people get more sick in the winter, when they are forced into close proximity with other people, making illness easier to spread, rather than the summer, when people are outdoors more, and can do things like walk to work in the warm summer sun rather than take the bus in the cold winter rain and snow? Stated differently, we naturally do more social distancing in the summer.
Social distancing in summer as a reason why people don't get sick is an interesting theory, any studies that support it?
There are lots of reasons for that. Vitamin-D is just one of those theories. There are also behavioral changes, such as people spending more time indoors and in sealed spaces. There is also the fact that certain viruses may survive better in colder, drier climates. There are also some theories that particles evaporate more quickly in the heat.
Not to mention... humans started wearing closes about 100,000 years ago.
Clothes sure, but still were outside in the sunlight during most of the day without sunblock. Take a look at hunter gather tribes still alive today. Not a whole lot of clothes! But sure, some.