I ran my first full marathon in October. I had run a few 1/2 marathons before doing the full. I'm not sure the 26.2 distance is for me but I'm still glad I did it. It was a major accomplishment for me. I like the 1/2's distance better. That's just me though.
I'm thinking of running a 1/2 marathon in March, but have not registered yet. I am registered for a 10 miler in April and plan to start training for that in January.
I agree that when it's cold and dark (and early) it's hard to get out there but I love to be able to get the run in before the rest of the day's responsibilities crowd in. Plus, sometimes I'm all done before I actually wake up mentally.
Good luck with your races whatever their length may be. Keep posting and let us know how you're doing.