snolover1 is right. Lake temps in the late summer or early autumn do not play a significant factor in total lake effect snowfall production for the season. If temps are a bit warmer to start the season, that might enhance (increase) some of the early season LES events (Nov, early Dec), but then by later December, the lake temps are almost always sitting within a degree or two of their long term average.
It's important to note that when we speak of "lake temps", we are only talking about the top 20-30 feet of water, below that, there is not much change from season so season and year to year. A big autumnal storm can send lake temps crashing by 10-15 degrees with the stirring caused by the wave action alone.
-John