Over 15mph I don't go out on the road. Bike path maybe, but its just not fun where I ride the road, and usually here once it's over 15, there are enough open places where gusts will hit you hard and that can just be dangerous. I ride for fun, so windy days are good days to go for a walk, hike, or mow the lawn.
I don't ride in rain unless I get caught in it, and snow..havn't yet, I gotta get my fat bike out...also need warmer clothes to do so.