I live in So Cal, but it got down in the low 40's last night. I have some young birds, about three months old, out in the chain link coop, no shelter of any kind except the roof. They had a small "introducing" cage, and an upended "Bunny Luv" carrot box with a door cut in it and bermuda on the floor they could go in with, but when they predicted wind I moved them down into the "den box" that a wolf used to sleep in, 360 degrees enclosed with just a door three feet tal land two feet wide. I moved their snuggle box down there with them, along with their feed and water. This morning they were not using their snuggle box and appeared anxious to come out and play, even with a stiff breeze still blowing.