Hey Mark,
There is a term for that condition,
"interminable, never-ending, depressing, lowly, 1,000 foot, I-feel-like-jumping-off-a-bridge GRAY/DRIZZLE. (I won't really jump off a bridge, but you get my point ) This time of year I feel the PNW weather sucking the life out of me, and not just because of boating.
It is sometimes called SAD, or Seasonal Affective Disorder, and is a viable, predictable, bonifide and treatable. Short of 2 weeks out of the month, every month from October to April, spent in those off shore islands, (Yup--Hawaii) making the difference, a good therapy light can help. Narrow band blue spectrum, 10,000 lux a day, especially with the Vitamin D can help. Of course, it is a good idea to consult a licensed medical care provider for an evaluation and a prescription. don't feel like the lone ranger though, SAD is much more common than most folks believe, but often times masked by the ubiquitous use of "antidepressants".