Temperate season | |
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![]() Leaves often turn orange and fall from trees in autumn. | |
Northern temperate zone | |
Astronomical season | 23 September – 22 December |
Meteorological season | 1 September – 30 November |
Solar (Celtic) season | 1 August – 31 October |
Southern temperate zone | |
Astronomical season | 21 March – 21 June |
Meteorological season | 1 March – 31 May |
Solar (Celtic) season | 1 February – 30 April |
Summer Spring ![]() Winter |
![]() | The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. (May 2021) |
Part of a series on |
Weather |
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Autumn, also known as fall in North American English,[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 for the leaves of deciduous trees as they prepare to shed.