For me, living in the Northeast US, this is a sore point. Even more important than the cold temps or snow on the ground.

There are some alleviating actions one can take, like full spectrum lights, vitamins D etc., but they can never come close to the real deal. If sunnier places with dry, comfortable year around weather were a real and practical option, I'd move overnight, but am unable to move just yet due to family + affordability reasons.