Weather doesn't effect the yearly routine of the turkeys that much at all. Their mating season is triggered by the increase in daylight hours, so it occurs pretty much the same time every year. It is not uncommon to hear turkeys gobbling on any calm morning, especially if its a little warmer than normal. I've heard them gobble in december, even seen the strutting then. Weather can effect the way a turkey "acts" on a particular day, but will not change the timing of the breeding.