Under the meteorological definition in the Northern Hemisphere, the months of autumn are strictly defined as:
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Autumn begins on the (approximately September 22nd or 23rd) and ends on the Winter Solstice (approximately December 21st or 22nd).
For the purposes of weather recording and climatology, meteorologists divide the year into four seasons comprised of three full months each. This simplification allows for consistent statistical comparison year over year.
This period begins on September 1st and ends on November 30th. In the Southern Hemisphere, the meteorological autumn months are March, April, and May.
In the Southern Hemisphere (Australia, New Zealand, South America, Southern Africa), the seasons are reversed. Consists of March, April, and May .
