I have 8 Welsummers, 5-6 weeks old and, unfortunately, I am too much of a newbie to be able to tell if they are fully feathereed out. I want to get them out of their brooder (they are starting to make escape attempts) and into their coop, but the night-time weather here (Utah) is running 35-40 degrees. Is that too cold for them It hasn't been bad during the day. I haven't any really feasible way of running electricity out to the coop, so I'm a bit worried about them getting too cold. They are lovely birds and I'd hate to see them suffer because I put them out too soon.