Smitty posted an medical paper on it, but think like a virus for a moment. The origin of all viruses, like a lot of life, is Africa. Africa is warm and dry. It is just that certain viruses bind to receptors in certain kinds of tissues, like air passage way tissue. Since cold dry weather in winter tends to dry out our nose and throat mucus membranes, it is easier for them to bind and infect. It is not necessarily that viruses are less present in summer, but we are better equipped to defend. That is the case for these seasonal types of influenzas. Viruses pretty much like the same kind of weather and climate we do, and can survive 5 days or so “in the wild” but cannot replicate while so. Like a lot of parasites they are hardy on their own and then replicate wildly once finding a host. You asked about “this virus” but all viruses share a lot of similar features. They are cells, they are extremely tiny, they translate, transpose, reverse transcibe, whether it’s DNA based or RNA doesn’t matter too much, similar mechanics etc. and I feel a lot the research is mostly genetic, not much actual cell biology work, because it’s just very hard to study them in an observable sense and probably, I’m guessing, that’s where the research dollars are these days, in genetics. (Science funding is always very biased toward new technologies.) I can give a specific example. The outer layer of animal viruses have a lipid (fat) coating, called a viral envelope or lipid bilayer. It is described as “buttery”. Not many studies on how temperature or humidity affects it. For humans, you would like to know what types of tissue one virus can bind too. For instance HIV-1 likes genital tissue. Strange but true, and that’s someone with AIDS is not going to infect you if he coughs. Lastly, it’s probably the case that all viruses are technically airborne. At 15 to 500 nanometers, that is small enough to interact with air molecules. It’s just a question whether they can float their way to a host tissue site that suits them or not and whether they can survive that journey. The viral envelope probably has some factor in whether it can live that way, but we don’t know, I’m just guessing. Just thinking like a virus.