Turns out, this fall ended up being one of the shortest in recent memory. There were several days in September and October with temperatures at or above 80 degrees, as recently as October 10th. That was almost two weeks ago. Since then, it's been much, much colder. Temperatures since then have averaged in the 50s.
So what's going on? The weather pattern has completely reversed. Most of the fall has seen a huge ridge in the jet stream over Central New York. The most recent pattern is called a trough. This brings much cooler than average temperatures and unsettled weather to the region.
The outlook over the next few weeks favors little change in the overall pattern. Cooler than average weather looks to continue as we head into November.