That is pretty cold for them. I hope you get your power on soon. I don't have a definitive answer for you but there's not much you can do. people try bagging them in pillow cases and putting a few of your favorites next to your body to keep them warm.. but you can't do that all day. Maybe find some of those hand warmers and throw them in the rack, just don't put them in the bins, they get way too hot and will cause burns.
Good luck,
Keep us updated.