I have killed several birds on some pretty nasty days. Never during the hard rain, but certainly before and right after. Fields are #1 thing I look for on those days. And they do not need to be huge, just where he knows he can strut and be seen. Everything slows down on rainy days. They sit on the limb longer, they work their way to a call slower and they gobble less often. But on those awesome nasty days when you do strike on gobbling, they are often very willing to play. Only lightning keeps me at home.