These are defined by the Earth's position relative to the Sun. They begin at the solstices (the longest and shortest days of the year) and equinoxes (when day and night are equal).
This is due to .
For those in the (like North America, Europe, and much of Asia), the 2026 start dates are as follows: Meteorological Start Astronomical Start (2026) Spring Summer Autumn (Fall) September 1 September 22 Winter December 1 December 21 The Southern Hemisphere Flip when does each season start
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