In previous years I've mostly stopped running during the winter, except on really nice days. But last year Ruth kept running all season, and she said it was 1. not as bad as you might think, even in the dark and even on real rainy nasty days, and 2. really excellent for her general morale. That seemed pretty convincing! And also, can't remember if I've mentioned this here, but ever since I stopped taking my ADHD meds on a regular basis I've needed noticeably more exercise in order to feel mentally steady. So, I'm gonna keep running all winter.
It's been going pretty good so far. Right now for clothing, I'm just using the wool leggings I found abandoned in a campsite a couple years ago, and a sleeved shirt made of some kind of technical fabric that I got at REI like 15 years back. I'm probably gonna need a windbreaker or something soon, but those are working pretty good even down into the mid-40°s
But! I've gotta say! Running in the mid-40°s feels incredibly rude on my lungs, and I'm not a big fan!! It's better than feeling antsy and stir-crazy. But I can confirm that it's NOT as good as running in a normal-people type of temperature.