Sounds like here.
Our winter temps are normally 30-45 degrees, but it can drop down to the 20's on really cold occasions. My Shamos handle the cold very well, as long as they're not new. If they're newly shipped (always from a warmer place) then I supply them with a heat lamp in their coop. But if they're not new, and adapted to the area, they can handle it pretty well. Snow, frost, hail, and of course, lots and lots and lots of rain. As long as their coop is warmer and drier than outside they should be fine.
Spring and summer gets to temps of 40-75 degrees, which they learn to like. Although Oriental Gamefowl normally prefer it warmer, they really do learn to love whatever sun they can get. If you have a less hardy breed such as Madagascar Games, Ga Noi, or some types of Asil - I'd suggest a place not too windy or plastic sheeting on the fence to prevent wind, drafts.
Before I got used to my Shamos I'd always ask people on their cold hardiness and most say they handle it just fine, but the thing is, those people live where summers are sunny and hot. Here, the birds have to wait and in the mean time, enjoy what they get.
