Well, looking at it as a lay person, as of right now it kind of makes sense. Look at where the big outbreaks are. Washington damp and cool and Upstate NY damp and cool.
Southern regions, yes we still have it down here, but not major outbreaks.
Down here in Florida a lot of us have UV bulbs in our AC units that kills viruses. As we go into Spring and Summer the sun gets stronger and the UV from the sun will get stronger. Hopefully that will stop the spreading and help with containment.