This is true for many US cities, but by far not all of them, and probably not even the majority. Places like SF, Los Angeles, Houston, Miami..etc, have very mil

This is true for many US cities, but by far not all of them, and probably not even the majority. Places like SF, Los Angeles, Houston, Miami..etc, have very mild winters that are relatively easier to deal with if you're homeless. I do question that it's largely the winter weather responsible. Even in places like Chicago, where the winter does get cold enough to quickly kill, there is still a large homeless population, so the weather alone isn't all that's at work. And similarly, Murmansk and Arkhangelsk are also very northerly cities with some serious winter weather, and there were plenty of homeless there too.