Influenza viruses have a protective sheath that works better in cold weather and allows them to survive longer outside a host: https://www.nih.gov/news-events/n

Influenza viruses have a protective sheath that works better in cold weather and allows them to survive longer outside a host: https://www.nih.gov/news-events/nih-research-matters/flu-virus-fortified-colder-weather https://www.nih.gov/news-events/nih-research-matters/flu-vir...