Personally, I find that I SI more in the winter months, and the past few years I've ended up inpatient in January. It's like January rolls around and suddenly everything is awful. I really don't want to go inpatient again, but I am willing to do it...I guess I kinda want to prove to myself that I CAN get through winter without being self-destructive.
So please post anything that helps you get through winter, or things you'd be willing to try. Here's a few of mine:
Hot showers (to combat the cold)
Mood therapy light (this has worked WONDERS for me)
Getting some exercise when it's warm enough, or walking at an indoor mall if it's really bad weather
Trying to sleep at night, and less during the day (avoiding day/night reversal, getting more sunlight)
Please add on to this if you have any winter-specific coping strategies.

xx loki