There’s Meteorological Seasons that align with months and astronomical seasons that align with equinoxes and solstices
The beginning of a new season is actually somewhat vague. It depends on what you decide to be the defining factor in the delineation between them. Do you go based on months (/temperature cycles), or do you go based on solstices and equinoxes (/length of days)?
| Meteorological | Astronomical | |
|---|---|---|
| Winter | Dec Jan Feb | Dec 21 - Mar 20 |
| Spring | Mar Apr May | Mar 21 - Jun 20 |
| Summer | Jun Jul Aug | Jun 21 - Sep 21 |
| Fall | Sep Oct Nov | Sep 22 - Dec 20 |