I used a Century II jacket from Performance last year, and was pretty happy with it.



It's very thin. It rolls up to about the size of a softball, maybe a little smaller. It was easily warm enough for me, and our winter temps are about like yours. It's available in blue if you don't like the low invisibility yellow. They claim it's "water resistant" though I honestly can't remember how it did in that regard. That probably means it did OK.