First Day of Fall Arrived at 2:50 am ET Saturday Morning

Brockville – Today is the official first day of Fall for 2023. The Autumn Equinox arrived at 2:50 a.m. this morning.

Autumn began astronomically in the Northern Hemisphere, and spring starts in the Southern.

But there are actually two measures of the seasons: “the astronomical seasons” (which follow the arrivals of equinoxes and solstices) and what’s called the “meteorological seasons.”

Astronomical fall is essentially the time period from the autumnal equinox up to the winter solstice. Those dates can vary by a day or two each year.

Meteorological fall is different … in that, the dates never change and are based on climatological seasons rather than Earth’s angle relative to the sun. These are perhaps the seasons that more people are familiar with.

Meteorological seasons are defined as the following: March 1 to May 31 is spring; June 1 to August 31 is summer; September 1 to November 30 is autumn; and December 1 to February 28 is winter.