Honestly Dawn, I have no idea why leaves fall early, but your theory could explain ours as well then. We also had a ton of rain early in the year. Corn in our fields were high as an elephant's eye as early as June because of that.
However, we've been in a drought since the end of June. Our rivers are at record low levels now. It's a total change from the past 2 years where we had so much rain that the rivers were always way too high, so much so that it caused problems with game fish species. The spring flooding waters ruined the spawns of smallmouth bass in our upper rivers (so the theory goes, although pollution has played a role in that too).