The ride home last night was fine, if a bit slow.
After I got home, I put my batteries (for the lights) back on to charge, packed my pannier back up with clean clothes and laptop, and went to bed.
This morning, I swapped the charged batteries into place, dressed for the cold, and brought the bike outside, and said "forget it", and turned around, and took the bike back in.
I'm sitting here at work after driving in, realizing that I ride less now than I did in July. I am a stronger rider now than in July. Why the lack of motivation?