In temperate climes, fall can be magical as trees display their autumn foliage.
©iStockphoto.com/Songquan Deng
According to the astronomical definition, fall begins with the autumnal equinox. In the Northern Hemisphere, it's the September equinox; south of the equator, it is the equinox in March.
September Equinox 2021 (Autumn Equinox, Northern Hemisphere)
(North America, Europe, most of Asia, northern Africa)
September Equinox in Cornwall, Ontario, Canada is on
Wednesday, September 22, 2021 at 3:21 pm EDT (Change city)
Sunrise, sunset and day length around September Equinox 2021
Countdown to September Equinox 2021 in Cornwall, Ontario, Canada
September Equinox in Universal Coordinated Time is on
Wednesday, September 22, 2021 at 19:21 UTC
Alternative Fall Start Dates
Meteorologists use a different method of defining the first day of fall. And, in some countries, the beginning of the seasons is determined by average temperatures rather than fixed dates or astronomical events.
Meteorological Seasons
According to the meteorological definition, the seasons begin on the first day of the months that include the equinoxes and solstices. In the Northern Hemisphere, for example:
spring runs from March 1 to May 31;
summer runs from June 1 to August 31;
fall (autumn) runs from September 1 to November 30; and
winter runs from December 1 to February 28 (February 29 in a leap year).
Dwindling Daylight
In most locations on Earth—except for tropical regions—the start of fall is accompanied by rapidly shortening days.
At any given location, the day-to-day difference in day length is greatest around the days of the equinoxes. After the fall equinox, days still get shorter, but at an ever-decreasing rate. On the shortest day of the year, the winter solstice, the day-to-day difference reaches zero.
At the same time, locations closer to the poles experience larger day-to-day differences. In Toronto, the day of the fall equinox is just under 3 minutes shorter than the previous day; in Miami, roughly 2000 kilometers or 1200 miles farther south, the difference is only about 1 minute and 30 seconds.
Day-to-day differences in your city
Our Earth is tilted as it orbits the Sun, which is the reason we have seasons on Earth.
Equal Day and Night?
Astronomical fall begins on the day of the equinox. The name of the event derives from Latin and means equal night, giving the impression that both day and night are exactly 12 hours long. However, that is not entirely true. In most regions, the day of the equinox is a bit longer than 12 hours.
Falling Temperatures
In the temperate zone, in particular, fall is also the time when the warm, stable weather of summer gives way to colder, more erratic weather conditions, though this varies substantially from one region to another.
Climate and monthly average temperatures in your city
Traditions and Folklore
The start of autumn and the fall equinox are celebrated in cultures and religions around the world with various fall traditions, holidays, and festivals.
Fall festivals: Mabon, Navaratri, and the Snake of Light
Fall Months
In the Northern Hemisphere, astronomical and meteorological autumn runs from September to December. South of the equator, it starts in March and ends in June.
Fall or Autumn?
Both fall and autumn are correct English terms for the season preceding winter. Autumn is primarily used in British English, while fall is a term more frequently used in American English.
Both fall and autumn are correct English terms for the season preceding winter. Autumn is primarily used in British English, while fall is a term more frequently used in American English.
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