A man walks by the New York Stock Exchange in a rain coat on Wall Street in October 2012. On average, the New York City's last 80-degree day comes in early October. File Photo by John Angelillo/UPI | License Photo

It's that time of the year again. The days are getting shorter and some corners of the country are already experiencing falling temperatures. Astronomical fall began on Sept. 22, and before long, Old Man Winter will be back in the picture.

This is the time of year when False Fall and Second Summer play a dancing game, where cooler periods are followed by unusually warm weather again, oscillating between the two in a dance.

"There can be several of each during the months of August through November at any location that experiences a change of seasons," said Jesse Ferrell, AccuWeather meteorologist and digital producer. "For any one point, a graph of an average of hundreds of years of temperatures shows a slow and steady progression downwards from summer heat temperatures into chilly autumn days."

Sept. 23, 2025 (NOAA/SERCC)