i cab imagine there are much more lovely weather than in SF, yet it’s the city with the largest number of homeless i’ve ever seen ( and i live in europe).
As I said, there are many factors, weather being just one.
No, it's not. A significant fraction of California outside of the Bay Area, and some of Oregon and, IIRC, Washington also does.
What do you mean by this? Because I live in Europe too and it's rare to see a homeless person, even in the bigger cities.