Autumn (known as fall in North American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in March (southern hemisphere) or September (northern hemisphere) when the arrival of night becomes noticeably earlier.
The equinoxes might be expected to be in the middle of their seasons, but temperature lag (caused by the thermal latency of the ground and sea) means that seasons appear later than d...
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Autumn (known as fall in North American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in March (southern hemisphere) or September (northern hemisphere) when the arrival of night becomes noticeably earlier.
The equinoxes might be expected to be in the middle of their 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, so some cultures regard the autumnal equinox as "mid-autumn" whilst others treat it as the start of autumn (as shown in the above table).
Autumn starts on or around 15 September and ends on about 20 December in traditional East Asian solar term.
In Ireland, the autumn months according to the national meteorological service, Met Éireann, are September, October and November. However, according to the Irish Calendar which is based on ancient Celtic...
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