Those of us who have been around for a long time, with X thousand hours under our belts, can often take off several months, maybe even years, and get back in the saddle again fairly easily. I've had at least a couple of times in my flying "career" in which I went from one BFR to the next one without any flying in between, and in each case, the BFR went fine. I was safe enough that I wasn't going to kill me or my passengers. Of course, it would have been better had I been flying all along.
But a newbie really can't do that, because as you've seen, the skills you've accumulated atrophy very quickly unless you regularly use them.
By all means, read all you can, participate in aviation forums, etc., but you must fly to remain proficient and safe. Winter is absolutely no excuse to lay low. I started my lessons on November 29, 1972, and took my checkride the first week of February 1973. From then until I got out of the USAF mid-May, I flew another 20+ hours. All of this was in the Anchorage area!
Yeah, there are days which are unflyable everywhere, winter and summer, but if getting into the air is a priority, you'll find ways to do it. You say, "But I'm just a VFR pilot, and this is the PNW." Well, we have participants on this board who are VFR-only pilots who live where you do. They fly all year long--maybe not ever day, but every time they can.
After I got out of the Air Force, I moved back to Laramie--different kind of winter weather than the PNW, but the kind of weather that is pretty discouraging for flying. But over the next 15 months, including the winter, of course, I accumulated enough training, skills, and hours to meet the requirements for the Commercial. I flew in high winds, on extremely cold days, just about any day that the FBO would allow (they, as most FBOs do, had restrictions based on the renter pilot's hours, skills, etc.).
To do that, I spent many hours getting dual instruction in addition to going up on my own without an instructor, but I also was able to do something that I think was very valuable. The FBO was an active charter outfit, much in single engine (I later flew SE charter for them). Often enough, the seats weren't full of paying passengers, so I went along. Although I wasn't allowed to fly while the passengers were aboard, I often did the flying on the deadhead legs. By doing that, I became pretty proficient in higher performance airplanes at no cost to me.
So get out there and fly! It's the only real way to stay "sharp" (to use your word).
Cary