My first 1000+ miles of backpacking were done solely in the Sierra's (JMT and surrounding areas) in late Aug and early Sept. I only had a total of 20 min of light rain for all those miles. As I ventured to new places like the Winds, Uintas, Colorado, etc, I encountered a lot more rain and really struggled with it originally as in my world......it never rains when I go out - smile. Not only was I a somewhat unhappy hiker, I was also unprepared for wet weather as I never had a chance to deal with it and learn.
This last fall I spent 8 straight days in the Uintas during the week that Colorado got all that rain. It rained EVERY day for the entire trip. This was the first trip where we weren't able to dry things off at any time as it was always wet. Here are the main things I learned either on this trip or things that I got to enjoy on this trip from some previous learning opportunities (rain).
1) My attitude won't keep me dry, however, it really helps me "enjoy" a wet week.
2) With good rain gear I personally never get wet so hiking in the rain all day, every day wasn't really all that bad. I almost started to enjoy it.
3) I have to pay much more attention to my feet when they are always wet as I found out under these conditions I tend to get blisters (typically I don't w/ drier feet).
4) I really like my sleeping bag and clothes in waterproof bags so i don't need a pack cover. With these items protected, I don't care if my pack get wet and i am not fighting with that "pack cover on, pack cover off" ritual.
5) It's not good to let both pairs of my hiking socks get wet as there is never a guarantee that I will get a dry and sunny day to dry either pair out.
6) Experience now tells me that throwing wet wool socks into the foot area of the sleeping bag either DOESN"T really work or I still haven't mastered that skill yet.
7) If I end up going to bed early and w/o dinner due to a heavy rain storm that doesn't stop, I will not die from starvation. rather, my same old breakfast tastes incredible the next morning.
All in all, I have found that rain is "JUST PART OF MY ADVENTURE" and the more i keep reminding myself of this and the more i try to learn how to deal with it better, the less chance it has to negatively effect my outing.