the water coming out of the body to form larger droplets that then fall to the ground faster combined with more overall water diluting the virus more on surfaces.

For me, it was the first time I heard a really good reason why warmer weather affects the spread of viruses / causes seasonal periods.

So -- it could be that places are explicitly instructed to not use air conditioning or to set it at 85 or some such value to purposely let more humidity exist inside.

Above is also why they talked yesterday during the presidential conference that the expect a 2nd wave in Q4 after a slowdown in Q3 that's the direct result of the current isolation methods and warmer weather.