I am right there with you.
Every year I go through this same ****. Lack of motivation, lack of interest and lack of drive. MY energy is fine but I just don't feel like doing stuff when it is cold and when it is dark.
I do prod myself though. Stuff has to be done around here. Lawns to mow, leaves to rake, general maintenance around the house and to the cars.
I usually feel pretty good up until about mid December. Once I get past Christmas and New Years, My mood generally picks up. By late January, I'm happy that the outdoor temps are climbing. By mid February, with temps in the upper 60s to low 70s, I am getting back to normal.