Autumn

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Autumn (fall)

Temperate season
Leaves often turn orange and fall from trees in autumn.
Northern temperate zone
Astronomical season	22 September – 21 December
Meteorological season	1 September – 30 November
Solar (Celtic) season	1 August – 31 October
Southern temperate zone
Astronomical season	20 March – 21 June
Meteorological season	1 March – 31 May
Solar (Celtic) season	1 February – 30 April
Summer Spring Autumn Winter

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Autumn, also known as fall (especially in US & Canada),^[1] is one of the four temperate seasons on Earth. Outside the tropics, autumn marks the transition from summer to winter, in September (Northern Hemisphere) or March (Southern Hemisphere). Autumn is the season 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 striking change in colour of the leaves of deciduous trees as they prepare to shed.