Sorry you're suffering mate but take heart as you can build up the fire and put on more clothes to ward off the cold. Heat is a completely different thing!
The temp you list is a mite above a typical winter high temp around here. In fact, now here in late Spring, that is still a common morning temperature, but in only a few more weeks we'll be dreaming of such deliciously cool mornings, and I'll be wire brushing and sanding the rust out of the swamp cooler to get it painted and back in service!