First thing is when I'm hunting in the rain I limit my shots to 20 yards and under. You really have to watch your arrow and make sure that you know exactly where you hit the deer. Watch the deer as it runs off also and see if you can see it fall if not pay close attention to the trail that it's taking. And remeber slow slow slow when your tracking. In the rain it's easy to miss sign that you normally wouldn't miss. Good Luck!