This answer isn't particularly helpful for a lot of people, but I live in ski towns for the winters. It's fairly frequent that I'll be skiing in full sun above

This answer isn't particularly helpful for a lot of people, but I live in ski towns for the winters. It's fairly frequent that I'll be skiing in full sun above the clouds, which is an excellent source of Vitimin D. When coupled with endorphine release from exercise it's basically impossible to be anything but ecstatic on that day. That said, the principal to combat SAD, in my experience, has been vitamin D and exercise. Try to maximize your exposure/intake of those (in whatever way is possible to you) and you'll feel good :)