It's cold for my chickens too. Too cold for a couple older ones. I noticed they weren't moving earlier today. So I scooped them up and brought them in the house. Put them in a dog crate which is now in our dining room. They both ate. That's a good sign. I'll keep them inside for another day or 2. Let them thaw and recover. Poor old birds.
My duck, on the other hand, thought that today would be a great day for a bath! Yup, she sat in her water dish and took a 20 minute bath. Got soaking wet (on the outside at least) and very carefully cleaned every single feather. When I went out to check on everybody coupla hours later, DuckDuck had hoary frost all over her back and wings. I wish I had had my camera with me because that would have been a neat picture.