We live in Central Florida, lots of mosquitos and rain! Our Coop design includes a screened area for the chicks to forage, and an enclosed nesting box. We love it! And I think they do too! It took my husband and I, 2 weekends to build. We had leftover flagstone from a previous project, so we used it to surround the outer base to detract predators from digging under the coop. We also extended the chicken wire 18 inches around the bottom, layed it in the dirt and covered it with the flagstones....so....if something tries to dig under it will only find wire! We lost 
1 of our 3 6 week old chicks the first night we put them into the coop. Evidently the 3 chickens were sleeping up against the base of the coop (pre-12 inch boards) and a critter must have reached through the wire, pinned one of the chicks and eventually pulled it through the wire. There was no evidence of what happened, except for flesh found on the wire where it was pulled through. SO...the 12 inch boards went up the next day along the bottom and so far.......fingers crossed.........no other problems.
1 of our 3 6 week old chicks the first night we put them into the coop. Evidently the 3 chickens were sleeping up against the base of the coop (pre-12 inch boards) and a critter must have reached through the wire, pinned one of the chicks and eventually pulled it through the wire. There was no evidence of what happened, except for flesh found on the wire where it was pulled through. SO...the 12 inch boards went up the next day along the bottom and so far.......fingers crossed.........no other problems.
