I have 12 chickens 6- 30 weeks and 6- 9 weeks that live in a 4x8 coop with 2 -8x8 runs attached. One covered and one open. All summer they have free ranged all day and returned to the coop at night. Now that winter is setting in should I lock them up all day or let them continue their behavior? Now that it is getting cold and snowing some I only see them outside a few times a day. They are not always in the coop just sitting under the covered run. Should the chickens just be left to do their thing or should I take measures to keep them warm and dry in the rain and snow?