RE: rain?????
We should really have a FAQ on this forum. Chuck, in the future (and now), you may want to try the Search function. Simply typing in 'rain' should get you quite a bit of information, especially since a lot of guys are going to stop answering this question once it's been posed about 50 times.
Now, to answer your question: anything you'd feel comfortable getting out and walking around in without a rain jacket, the deer will walk around in the same as always. If you hunt in warm climates, they'll actually walk around more. Once the rain kicks up to uncomfortable levels, though, you're going to have to get down and walk. Push through the kind of cover you'd be getting into if you were trying to get out of the rain - cedars, thick areas with a lot of overhead foliage. Realize that the rain and wind will 1) make it harder for the deer to hear you; 2) wet the ground so you won't rustle dry leaves and crack dry branches; and 3) cover your scent. I can't imagine much, this side of a hurricane, I wouldn't hunt in.
Good luck!