From my 18 yrs hunting the birds I have found that setting up on open fields, Ridge roads or woods that are EXTREMELY OPEN work great. Fields the most though. Just like any human would do in a rain storm, do you like to walk through wet brush and weeds and get all wet and matted down? The same thing is true of turkeys, they don't like getting their feathers all soaked. They would rather stand in the rain and shake themselves off than walk around through that brush. So by all means hunt in the rain, as long as it isn't a torrenchal down pour. I have even had birds gobble tons to thunder. Just pack your rain gear and stay put. They will come to the field or that open logging road to do their stuff.