Starts on the Autumnal Equinox (usually September 22 or 23) and ends on the Winter Solstice (around December 21). This means the season officially stretches into late December . Autumn Months in the Southern Hemisphere

Animals begin preparing for winter by gathering food, growing thicker coats, or migrating to warmer climates.

📆 September, October, November These are the three months with the clearest transition from summer heat to winter chill in the Northern Hemisphere.

The astronomical definition is based on the position of the Earth in relation to the Sun. Under this definition, the timing of the months shifts slightly based on the equinoxes and solstices.