What utter nonsense. Portland has an incredibly inhospitable climate (I mean I live in a lovely house and I find it overbearing). And yet we have more than enough people willing to tough it out in the torrential downpours.
Portland has moderate weather like the rest of the northwest. Have you tried living in New York during the winter?
This doesn't contradict what I said. I don't know much about Portland's homelessness problem, but I'd guess that being the largest city in the state, and having famously left-wing laws, might attract people on the margins to come. There are probably a lot of reasons.