Start: When Does Autumn

Because the Earth’s orbit is elliptical and doesn't take a perfect 365 days to circle the sun, the date of the equinox shifts slightly from year to year. Generally, it falls on in the Northern Hemisphere.

(Australia, Brazil, South Africa): Autumn starts between March 19–21 . when does autumn start

For gardening, school holidays, or weather tracking, check which definition your local forecasters use. Most weather apps default to meteorological seasons. Because the Earth’s orbit is elliptical and doesn't

Many birds begin their southward migration, while mammals gather food stores for hibernation. For gardening, school holidays, or weather tracking, check

Are we bound by the astronomical calendar, or do we stick to the meteorological one? And why are the dates different in the first place?

In the Northern Hemisphere, meteorological autumn begins on September 1st and ends on November 30th. This definition is based on the annual temperature cycle and the climatological patterns of the region. Meteorologists use this definition to make it easier to compare data from year to year.