In the Northern Hemisphere, fall arrives in September, October, or November, but in the Southern Hemisphere, it begins in March and lasts until May. The Difference Between Start Dates Because the astronomical date is based on the sun's position, it shifts annually, typically occurring between September 21st and 24th in the Northern Hemisphere.
Cultural Signs Indicating the Start Date of Fall
The Astronomical Definition Astronomically, fall begins with the autumnal equinox, an exact moment when the sun crosses the celestial equator, moving from north to south. This unique alignment ensures that most locations on Earth experience approximately 12 hours of sun and 12 hours of darkness.
Cultural and Natural Indicators Many cultures and communities rely on environmental cues rather than the calendar to determine the start of the season. This approach ensures that each season lasts exactly three months, which simplifies the comparison of climate data and weather statistics from year to year.
Cultural Signs Indicating the Start of Fall
Definition Start Date Basis Astronomical Fall September 22 or 23 (variable) Earth's position relative to the sun. This method answers when does fall begin in a way that is practical for record-keeping and weather prediction.
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