I didn't learn this recently and in fact, I'm not sure I've learned anything at all recently. My wife might add "ever." But someone else's suggestion that it only rains on weekends, in so many words, seems to almost be true. It doesn't rain if I have to cut the grass but it will if I plan an outing. At least it does often enough to prove a point. But it doesn't necessarily make for a bad day in the woods.
There will usually be fewer people out and about but you can't count on it, if it matters. But it gives you something to think about. "What should I do differently when it rains?"
You know those statements that say light weight hiking shoes dry fast? Well, they don't. They take a good two days at least. Longer than leather, it seems. Anyhow, I got the bright idea of getting a pair of so-called "surf shoes." They're basically sandals with a closed toe with a bungee cord fastening. I figured as long as your feet are going to get wet, you might as well wear shoes made for it. I did get a pair but never got around to using them under those conditions. So I guess I haven't learned anything yet.