In the Northern Hemisphere, fall, also known as autumn, typically starts around September 22nd to 23rd and ends around December 21st to 22nd. The exact date varies each year and is determined by the autumnal equinox, when the sun crosses the celestial equator from north to south.
During the fall equinox, day and night are roughly equal in length, and after this point, the days gradually become shorter as winter approaches.
