Its mostly about the lack of sunlight. Skiing might help a bit because you are outside in the sun but you are not really getting much sun on your body. Any disorder like that is hard to understand if you don't have it.
Im a california boy that went to college in Washingtson. Yeah, SAD fucking crushed me.
I bought a lamp, but never really had time to actually use it properly. Supplementing Vitamin D helped a bit. But overall, it was no bueno. As much as i love the PNW, i will not be moving there. I gotta have 200 days of sun at a minimum.
Its better to burn out
than to fade away
my my, hey hey
SAD is a real thing for a lot of people, myself included. Skiing helps for sure, but if you grew up in a state with a lot of sunshine and now live where you don't see the sun too much, it kind of messes you up. For me it's just a mild depression at certain times when I'm not skiing, but not super difficult. For others it can lead to real depression. Vitamin D is supposed to help to make up for the lack of that vitamin through absorption in the skin from sunlight.