this is the explanation for why the flu is seasonal:

1. Viral Stability in Cold, Dry Air:

Influenza viruses survive better and remain in the air longer when the air is cold and dry. Low absolute humidity (the total amount of water vapor in the air, which is lower in winter even when relative humidity is high) allows the tiny respiratory droplets that carry the virus to stay suspended for longer periods and travel farther.

2. Host Immune Response: Cold, dry winter air can also impair our innate immune defenses. The mucociliary clearance system, which is the layer of mucus and tiny hairs (cilia) in our respiratory tract that traps and clears out pathogens, works less efficiently in these conditions

3. Human Behavior: During colder months, people spend significantly more time indoors in closer proximity to one another. This increased crowding in homes, schools, and offices facilitates easier transmission of the virus through respiratory droplets and aerosols.

does this sound logically coherent to you?