I’ve long asked myself the same question:
Researchers in New York believe they have solved one of the great mysteries of the flu: Why does the infection spread primarily in the winter months?
The answer, they say, has to do with the virus itself. It is more stable and stays in the air longer when air is cold and dry, the exact conditions for much of the flu season.
“Influenza virus is more likely to be transmitted during winter on the way to the subway than in a warm room,” said Peter Palese, a flu researcher who is professor and chairman of the microbiology department at Mount Sinai School of Medicine in New York and the lead author of the flu study.
I’m also curious as to why cold weather seems to cause a runny nose. I wonder if that study has already been done…