As a person from the literal equator, I struggle a lot with winter. Not the cold, since it's not really that cold here in northern California, but with the increasingly shorter days. The best way I can describe it is that I feel as though my brain, happiness, and overall health is powered by the sun. The sun is my battery. The less of it there is, the worse I feel. Every year, without fail.
Going out for a run or walk daily has been the only thing that's worked to help me feel okay consistently. Even when it's grey and gloomy and rainy (the extent of winter here in San Francisco, but already way too awful for me), I try to go out for a run. I carry a tiny Olympus XA2 in my pocket and I take photos of the things that I see.
I see many beautiful things, because San Francisco is beautiful, and being outside in the beauty restores me.
Sunny, windy days.
Market days at Fort Mason.
Overcast but still lovely days.
(All photos taken on an Olympus XA2, Fuji Superia 400, self-developed at home with Bellini C-41 kit and scanned on Plustek 8200i)