[hinkley]

Air circulation is compromised in the winter because we close all the windows and doors, and generally we congregate closer together.

For a long time that was considered to be the only reason colds happen more in cold weather. This thing with influenza viability would change that (of course, what one study finds another refutes, so who really knows).

[nkozyra]

Here in Florida no circulation season is April - November. And yet flu season is still winter, the only part of the year where people even consider opening windows.