The weather is very nice in the northern New England states right now so people are probably outdoors a great deal of the time. I think that Covid, just like the flu, flourishes when people are indoors. People are indoors in the winter in the north but they are indoors in the summer in the south. It is both breathing the fresh air, getting exercise as well as vitamin D from the sun that makes a big difference.
Ahha, that does make sense!