Man, that's solid work. I had a similar stint doing coastal surveys in the wet, and what got me through was keeping up with those stretches, rain or shine. I made it a point to do them right after waking up, even when it was pouring. My knees felt steady the whole time with no aches. It's all about that routine, sticking to it no matter what. Seeing results like no pain makes it worth it.
Remember when I skipped my stretches for a week last fall? I was doing some trail work in the drizzle and thought I could tough it out. My knee locked up on the third day, and I had to sit out while the crew moved on. Now I see why sticking to it matters, even when it's miserable. Why do we always learn the hard way?
Discipline makes all the difference in nasty weather. Anthony_rivera showed that with his stretch routine keeping him pain-free. Stick to it or pay the price later.