December is pretty late for starting dormancy, your plants should already be well into the process by now. I have never needed to do dormancy in the fridge, so I cant help you much with that. I have read advice from other growers that its not THAT hard to do, I think people are making way more out of it than they really need to. Your temps look a little on the low range but they should be ok if you bury the pots and use lots of mulch. Bringing the plants indoors on the coldest nights is not a problem at all (I could swear I said that already in this thread lol) I routinely bring my plants indoors when I know the temps will drop below 30 F.