We are still getting used to a "new normal" of devastating summer heat waves. But the effects of a warming climate are being felt throughout the year, and recent autumn months have been further off the charts than ever.
Earth Sciences
Nov 14, 2023
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14
Bats gather to feast as nocturnal insects fly through mountain passes in the Pyrenees each autumn, new research shows.
Plants & Animals
Aug 15, 2023
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54
In a warming climate, spring keeps getting earlier. But the timing of leaf fall in autumn has been more of a mystery. For the first time, a study by researchers including biologist Susanne Renner in Arts & Sciences at Washington ...
Plants & Animals
Jul 7, 2023
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147
Sick of sweltering summer heat? Well, you are in luck, because fall starts Thursday, at least according to meteorologists.
Earth Sciences
Sep 1, 2022
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21
Searing summer temperatures in the UK have not just parched the earth and dried up rivers, lakes and reservoirs but are also seeing trees shed their leaves early.
Ecology
Aug 24, 2022
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43
New research finds that longer and warmer autumns make it less likely that green-veined white butterflies will survive winter to emerge in spring. The findings are published in the British Ecological Society journal, Functional ...
Ecology
Apr 1, 2022
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13
Conservation group BirdLife Cyprus reported Wednesday a "worrying increase" in illegal bird trappings last year, blaming authorities for reducing fines for killing protected species.
Ecology
Feb 23, 2022
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7
The likelihood of hot, dry, windy autumn weather that can set the stage for severe fires in California and western Oregon has increased 40% due to human-caused climate change, new computer models show.
Environment
Feb 23, 2022
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91
November 2021 was quite warm and dry across the U.S., wrapping up a very warm autumn—and year so far—for the nation.
Environment
Dec 9, 2021
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9
A team of researchers affiliated with multiple institutions in the U.S. and one in Canada has found that the increasing number of large fires in Southern California during the autumn and winter months are mostly due to the ...
Autumn 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. Meteorologists (and most of the temperate countries in the southern hemisphere) use a definition based on 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 is usually considered to start with the September equinox. In traditional East Asian solar term, autumn starts on or around 8 August and ends on 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 Celtic traditions, autumn lasts throughout the months of August, September, and October, or possibly a few days later, depending on tradition. In Australia, autumn officially begins on March 1st and ends May 31st According to United States unofficial tradition, autumn runs from the day after Labor Day (i.e. the Tuesday following the first Monday of September) through Thanksgiving (i.e. the fourth Thursday in November), after which the holiday season that demarcates the unofficial beginning of winter begins.
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