It doesn't actually have to be raining to stop regular paper from working. The slightest humidity in the air can make it a real pain.
So Rite in the Rain notepads for me too. They really are the best. And with capacity for 2300 logs, I have never felt compelled to restrict their use to good wx days.
With a RitR pad, you simply can't go wrong with a normal HB pencil.