| Definition | Northern Hemisphere | Southern Hemisphere | | :--- | :--- | :--- | | | Sept, Oct, Nov | Mar, Apr, May | | Astronomical | Late Sept – Late Dec | Late Mar – Late Jun | | Common Usage | "The -ber Months" (Sept, Oct, Nov) | Mar, Apr, May |
Meteorologists and climatologists divide the year into four groups of three months based on the annual temperature cycle and the Gregorian calendar. This method makes it easier to track climate statistics. September, October, and November. It begins on September 1st and ends on November 30th . Southern Hemisphere Meteorological Autumn: March, April, and May. It begins on March 1st and ends on May 31st . 3. The Astronomical Perspective autumn in which month
Here is a breakdown organized by the three main ways autumn is defined. | Definition | Northern Hemisphere | Southern Hemisphere