As Governor Gavin Newsom says, it’s all about seasonality:

“We know why: because [of] the seasonality to COVID,” Newsom said. “It’s not particularly difficult, after a couple of years, to understand. You see those trends in Europe. You see those trends extend in other parts of the globe. Unfortunately, that’s what’s happening here.”

https://www.latimes.com/california/story/2021-11-09/winter-i...