I've found many times, especially during the early season that a light rain actually seems to increase deer movemnet and relax them a bit. Generally I hunt as if the rain doesn't mean a thing to the deer, it's just another day in the life of Mr. Whitetail..... unless it's a hard downpour. Just remember to use extra caution with shot selection and angle, don't plan on sorting out much of a blood trail in any sort of rain. Good luck and good shootin'