I don't have a problem sitting in the rain, as y'all have said, that's why we buy rain gear. As a matter of fact, sitting in the rain and being there when it quits and clears up can be quite rewarding, especially if it's been raining a while, you can be there when they get up to go eat.
I am much more inclined to sit all day during gun season during the rain than I am with my bow. If it's raining to beat hell and I stick a nice deer it's really hard to go home and wait 3 hours before you start tracking it. As y'all know, the rain will wash away some or a lot of the blood. I don't want to do anything that will increase my chances of not finding a deer, God knows bowhunting is challenging enough! So during bow season when it's really cutting lose, I'm more inclined to do as Govt Mule said and sit in the barn and drink beer!