The big one with cold temperature and being sick is what you do with your day. When it’s warm you have a BBQ or go for a hike, or the beach, etc, they are all outside, and usually fairly socially distantanced.
When it’s cold you watch TV, play video games, or throw an indoor party, where you’re usually in a room with terrible ventilation and packed so close to each other you are literally touching your guests.
Social distancing matters a lot for disease transmission, and it’s super easy to do on a nice day outside and super hard on a cold day inside.
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