Wondering if anyone can shed some light on raising Cornish cross chickens during the colder months of October through December. They would be ready to process December 20. I live in the Pacific Northwest so temperatures don’t get too extreme but I would like some insight as far as how well they deal with the temperature and what precautions I should take. They will be in a covered tractor with two heat lamps. I’m mostly worried about the rain. I can Cover the sides of the tractor but I’m wondering if a little rain on the ground will be a big issue.