Have a look at hcov’s seasonality in figure 2 here: https://www.annualreviews.org/doi/10.1146/annurev-virology-0...

“It’s not seasonal” is one of the mantras health agencies repeated in february, along with “masks aren’t shown to work” and “it doesn’t” spread by aerosol.

My guess is your health agency simply hasn’t re-examined their beliefs as evidence came in.

First wave ended in June in the northern hemisphere and started in the southern hemisphere at about the same time. We are seeing a similar shift in the second wave.

It can be a coincidence but since people are more likely to stay inside when it is cold outside, and transmission is more likely inside, it makes sense.

Since the cold season is usually when it is cold outside, yeah. Might be more than coincidence.