Swede in Oaxaca att the moment. 0 C we would put on a jacket, but something that is often missed is that we later go in and warm up. Many Mexican houses are not built to keep the cold out. I spent a couple of winter weeks in Toluca a few years ago and the nights was freaking cold. The concrete walls store the cold as ice blocks and there's no heaters or radiators.

Yes, 44 would definitely be uncomfortable. Even 30 would be uncomfortable really.