If you're using the astronomical definition, the first three weeks of December are still considered fall. The season doesn't end until the winter solstice around December 21 or 22.
Both terms refer to the same season, and in this article, we use them interchangeably. what months are the fall
While astronomical fall includes the first three weeks of December, most people and all meteorological systems consider December the start of winter. By December 1, the atmosphere generally behaves like winter. If you're using the astronomical definition, the first
Meteorologists divide the year into equal three-month blocks based on the temperature cycle. This makes it easier to track and compare climate statistics year-to-year. September, October, and November. Start Date: September 1st. End Date: November 30th. 2. Astronomical Fall While astronomical fall includes the first three weeks
The dates shift slightly each year because Earth's orbit around the sun takes approximately 365.25 days. Leap years also affect the timing. Here are the typical dates for the next few years:
Traditionally includes August, September, and October based on the ancient Gaelic calendar.
On Sunday, Nov 16, 2025, at 12 AM ET, we will be performing scheduled maintenance on our systems.
During this time, our payment system will be inaccessible.
We estimate that our payment system will be back online by 12:30 PM ET. We appreciate your patience and apologize for any inconvenience this may have caused.
Happy Holidays!
Our offices will be closed on 12/24, 12/25, and 1/1. On December 24, a limited staff will be available from 8:30 AM to 4:30 PM to assist you. We appreciate your partnership throughout the year and wish you a safe and joyful holiday season.