Autumn, also known as fall in North 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.Some cultures regard
the autumnal equinox as "mid-autumn", while others with a longer
temperature lag treat the equinox as the start of autumn. In the
English-speaking world, Autumn traditionally began with Lammas Day and
ended around Hallowe'en, the approximate mid-points between Midsummer,
the autumnal equinox, and Midwinter. Meteorologists (and most of the
temperate countries in the southern hemisphere) use a definition based
on Gregorian calendar months, with autumn being September, October,
and November in the northern hemisphere, and March, April, and May in
the southern hemisphere.In North America, autumn traditionally starts
with the September equinox (21 to 24 September) and ends with the
winter solstice (21 or 22 December). Popular culture in the United
States associates Labor Day, the first Monday in September, as the end
of summer and the start of autumn; certain summer traditions, such as
wearing white, are discouraged after that date. As daytime and
nighttime temperatures decrease, trees change color and then shed
their leaves. In traditional East Asian solar term, autumn starts on
or around 8 August and ends on or about 7 November. 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 Gaelic traditions,
autumn lasts throughout the months of August, September and October,
or possibly a few days later, depending on tradition. In the Irish
language, September is known as Meán Fómhair ("middle of autumn")
and October as Deireadh Fómhair ("end of autumn"). Persians celebrate
the beginning of the autumn as Mehregan to honor Mithra (Mehr).
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.Some cultures regard
the autumnal equinox as "mid-autumn", while others with a longer
temperature lag treat the equinox as the start of autumn. In the
English-speaking world, Autumn traditionally began with Lammas Day and
ended around Hallowe'en, the approximate mid-points between Midsummer,
the autumnal equinox, and Midwinter. Meteorologists (and most of the
temperate countries in the southern hemisphere) use a definition based
on Gregorian calendar months, with autumn being September, October,
and November in the northern hemisphere, and March, April, and May in
the southern hemisphere.In North America, autumn traditionally starts
with the September equinox (21 to 24 September) and ends with the
winter solstice (21 or 22 December). Popular culture in the United
States associates Labor Day, the first Monday in September, as the end
of summer and the start of autumn; certain summer traditions, such as
wearing white, are discouraged after that date. As daytime and
nighttime temperatures decrease, trees change color and then shed
their leaves. In traditional East Asian solar term, autumn starts on
or around 8 August and ends on or about 7 November. 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 Gaelic traditions,
autumn lasts throughout the months of August, September and October,
or possibly a few days later, depending on tradition. In the Irish
language, September is known as Meán Fómhair ("middle of autumn")
and October as Deireadh Fómhair ("end of autumn"). Persians celebrate
the beginning of the autumn as Mehregan to honor Mithra (Mehr).
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