Hello Fellow Chickeners: This is my first winter with chickens and I'm nervous about them being out in the cold. We live in the San Francisco Bay Area and it is usually pretty temperate but the weather forecast has the nighttime lows between 31 and 21 degrees for the next week. I know the chickens are wearing lovely down coats but that seems extra chilly. We have a Rhode Island Red, a Silver Laced Wyandotte and an EE. All are about 5 months old. At night they are in an enclosed coop with sand on the bottom and open nest boxes with pine shavings. Will they be ok without a heater out there or being brought into the house? During the day the temps will be in the mid to high 50s so I'm not too worried about their free range time. Thanks as always for all the support, Lynn in Oakland.