Cultural events, almanacs, and official start dates.
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
More specifically:
Deciduous trees respond to shorter daylight hours by stopping the production of chlorophyll, revealing the vibrant reds, oranges, and yellows of the leaves.
This definition is based on the position of the Earth's axis in relation to the sun (specifically the equinoxes and solstices). Because the specific dates shift slightly every year (due to the leap year cycle), the months are not fixed to the 1st of the month. autumn in which month
The timing of (or fall) is not fixed to a single month but is determined by two distinct frameworks: the astronomical calendar and the meteorological calendar. Additionally, the specific months associated with autumn depend entirely on which hemisphere you are located in. 1. Timing by Hemisphere
Historically, these months represent the primary period for harvesting crops before the frost of winter. Cultural events, almanacs, and official start dates
Weather records, seasonal statistics, and climate studies.
In the Northern Hemisphere, generally spans the months of September, October, and November . September, October, and November
Autumn: A Comprehensive Analysis of Its Seasonal Timing and Variations
Autumn generally occurs in in the Northern Hemisphere, and March, April, and May in the Southern Hemisphere . However, the exact timing depends on whether you follow the astronomical or meteorological calendar. Quick Reference: Autumn by Hemisphere