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Autumn (also Fall in American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter usually in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier.
The equinoxes might be expected to be in the middle of their respective seasons, but temperature lag (caused by the thermal latency of the ground and sea) means that seasons appear later than dates calculated from a purely astronomical perspective. The actual lag varies with region. Some cultures regard the autumnal equinox as "mid-autumn", others with a longer lag treat it as the start of autumn.[1] Meteorologists (and most of the temperate countries in the southern hemisphere)[2] use a definition based on months, with autumn being September, October and November in the northern hemisphere,[3] and March, April and May in the southern hemisphere.
Autumn (also Fall in American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter usually in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier.
The equinoxes might be expected to be in the middle of their respective seasons, but temperature lag (caused by the thermal latency of the ground and sea) means that seasons appear later than dates calculated from a purely astronomical perspective. The actual lag varies with region. Some cultures regard the autumnal equinox as "mid-autumn", others with a longer lag treat it as the start of autumn.[1] Meteorologists (and most of the temperate countries in the southern hemisphere)[2] use a definition based on months, with autumn being September, October and November in the northern hemisphere,[3] and March, April and May in the southern hemisphere.
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