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Autumn is three months long, from the autumnal equinox to the winter solstice. This will be from mid-September to mid-December in the Northern Hemisphere and mid-March to mid-June in the Southern Hemisphere. In terms of days, autumn can be considered to last either 91 or 92 days (one fourth of the year).
In the Northern Hemisphere, autumn (fall) begins on September 22 or 23 and ends on December 21 or 22.
In the Southern Hemisphere, autumn begins on March 20 or March 21 and ends on June 20 or June 21.
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Rene
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SteveAutumn typically lasts for 13 weeks in the Northern Hemisphere, starting around September 22nd and ending around December 21st. This duration is based on the astronomical definition of autumn, which is determined by the position of the Earth in relation to the sun. However, meteorologists often define autumn as lasting for three months, starting on September 1st and ending on November 30th, which is a period of 13 weeks as well.
The average length of the northern hemisphere spring / southern hemisphere autumn from 1900 to 2150 is 92.739 days, and the average length of the northern hemisphere autumn / southern hemisphere spring during the same period is 89.861 days. The sum of the two averages is 182.600 days.
The reason spring is longer than fall in the northern hemisphere is Earth passes its aphelion, the point in its orbit that is farthest from the sun, in early July, and the farther an orbiting body is, the slower it travels.
Each season is around thirteen weeks long.
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