How to put this carefully:

There are *many* uncertainties surrounding coronavirus *including* about weather.

It seems like the uncertainties are greater if you do *not* assume that weather plays some role in why it spreads more/faster in some places than others.

And that's also what most of the research seems to find. The headlines are often like "don't count on weather to kill coronavirus". But the research itself generally seems to find some effect, though one that's 1) uncertain and 2) very unlikely to be enough to stop it on its own.

Also, some of the "don't get people's hopes up about weather!" sentiment seems misguided even from a strategic communications standpoint, because it could lead to a case where things seem "surprisingly" good in the summer then come back with a vengeance in the fall.