Posters above are correct about the rain. When given free access, they'll be out in the rain pretty often, but the colder it is, the less likely they are to do it. I let them do what they want in that department.
I would suggest for the bigger ones that the roost be less than 4 feet off the ground. Mine is a bit above 4 feet and while that's ok for my hatchery buff orpingtons, my much larger Splash actually did bruise his keel (chest bone) jumping down from there. He was around 10 lbs. So far I don't think any of the bigger hens have but I'm going to lower it first chance I get.
I would suggest for the bigger ones that the roost be less than 4 feet off the ground. Mine is a bit above 4 feet and while that's ok for my hatchery buff orpingtons, my much larger Splash actually did bruise his keel (chest bone) jumping down from there. He was around 10 lbs. So far I don't think any of the bigger hens have but I'm going to lower it first chance I get.