My favorite time to "rain hunt" is the week before gun season, walking in the woods still hunting with a bow during a drizzle or slight wet snow with a mild, swirling breeze. I've never seen more deer than during this kind of condition. Here in Michigan, it is right around the rut, before the guns put the deer in the caution mode, and they move about pretty easily. They aren't going about their day with "reckless abandon" (except some of the young bucks) but its fun to play "sneak peek" with them. Scent, sound, and movement become obscured for both you and the deer, so it pays to move slow and steady with frequent stops. And you are normally out there alone b/c so few hunters want to don their wet weather gear and go for it.