Autumn, also known as fall in American English, is one
of the four temperate seasons. Outside the tropics, autumn marks the
transition from summer to winter, in
September (Northern Hemisphere) or
March (Southern Hemisphere), when the duration of daylight
becomes noticeably shorter and the temperature cools considerably. Day
length decreases and night length increases as the season progresses,
until the Winter Solstice in December (Northern Hemisphere) and June
(Southern Hemisphere).One of its main features in temperate climates is the shedding of
leaves from deciduous trees.
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