While we generally have a mild winter compared to most areas of the US, the period around the Christmas and New Years holidays is usually the coldest time where I live in Northern California. The little space heater I have in the train room does a decent job of keeping the room at 60 degrees or higher until the overnight lows dip into the 30's.
During this time I turn my attention to the things that keep me moving and warm and keep the progress going on the layout. Recently I went to Lowes and purchased another 4 x 8 sheet of tempered hard board to use for fascia and lighting valances and also a sheet of Fiberglass Reinforced Plastic or FRP to use to mount the photographic back drops on.
I got a coat of primer on it now and am thinking about what color I want to use for the fascia.
This cold snap should not last too long and I'll then get back to things like scenery and decoder installs.