Having a power meter makes riding in wind more fun. Sure your average speed goes down, but average Watts...?
I'm kind of a sissy when it comes to riding in rain, not because of any personal discomfort, but riding in rain is like riding through a highly carcinogenic atmosphere from your bicycle's perspective--it can drastically shorten the lifespan of every component, every place where metal meets metal, and god-only-knows what kind of substances have been collecting down on the road that get splashed up and become more corrosive when combined with water. Some people joke, "Your bike won't melt."
True, but the drivetrain will wear out faster, all metal surfaces will oxidize faster, and it's a PITA to clean your bike after riding in the rain.
Happily I live in North San Diego County and rain is a pretty rare event here.