| Season | Typical Start Date | Typical End Date | | :--- | :--- | :--- | | Spring | March 20 (Vernal Equinox) | June 20 or 21 | | Summer | June 20 or 21 (Summer Solstice) | September 22 or 23 | | Autumn | September 22 or 23 (Autumnal Equinox) | December 21 or 22 | | Winter | December 21 or 22 (Winter Solstice) | March 20 |