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www.reference.com/science/autumn-start-end-8ae13fbf9aa7fa79

When Does Autumn Start and End? In the Northern Hemisphere, autumn is between the autumnal equinox that begins on Sept. 22 or 23 and the winter solstice, which is Dec. 21 or 22. In the Southern Hemisphere, autumn is between March 20 or 21 and June 21 or 22.

www.bbc.com/news/uk-northern-ireland-29014886

It's that time again - one of the four times in a year that the seasons change, and the usual question arises. When do the seasons actually change? When, in this case, does autumn begin? Well it ...

agelesshistory.com/fall-autumn

What is the Fall/Autumn Season? Start & End of Fall/Autumn 2019 – Also known as autumn, fall is the season that follows summer and precedes winter.In the United States, there is a term called ‘autumnal equinox’, which simply means that the daytime and nighttime hours are the same.

www.answers.com/Q/When_does_autumn_begin_and_end

Autumn is the time of year when summer changes into winter. This transition period has no fixed time, it all depends on the local weather pattern at the time, so autumn ends when winter starts.

www.timeanddate.com/calendar/aboutseasons.html

Seasons: Meteorological and Astronomical. When do spring, summer, fall, and winter start and end? It depends on which definition you use and if you are north or south of the equator.

www.almanac.com/content/first-day-seasons

Astronomical Season vs. Meteorological Season. The astronomical start of a season is based on the position of the Earth in relation to the Sun.More specifically, the start of each season is marked by either a solstice (for winter and summer) or an equinox (for spring and autumn).

www.thesun.co.uk/news/4144147/autumn-begin-summer-end...

WHEN DOES FALL FALL? What date did autumn 2018 start, when did summer officially end and when was the autumnal equinox?

www.calendarpedia.com/when-is/fall.html

Fall, usually called autumn outside of North America, is one of the four seasons that make up the year. It is the intervening period between the warmest time of the year, summer, and the coldest time of the year, winter. Astronomical fall vs. meteorological fall There are various ways to define the start and end dates of fall.

en.wikipedia.org/wiki/Autumn

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 shed their leaves.

www.almanac.com/content/first-day-fall-autumnal-equinox

Q: Is the Autumnal Equinox Really the First Day of Fall? A: Based on the astronomical definition of seasons, yes, the autumnal equinox does mark the first day of fall (in the Northern Hemisphere). However, according to the meteorological definition of seasons, which is based on temperature cycles and the Gregorian calendar, the first day of ...