The season integration will provide the current astronomical or meteorological season (Spring, Summer, Autumn, Winter) as a sensor.
Adding Season to your Home Assistant instance can be done via the user interface, by using this My button:
If the above My button doesn’t work, you can also perform the following steps manually:
For information on the difference between astronomical and meteorological seasons please see the link below:
All information about how the seasons work was taken from Wikipedia:
To cut a long read short, Astronomical gives seasons based on the shortest/longest day and equinoxes. So in the Northern Hemisphere spring starts on 20 March). Meteorological gives seasons based on months (so in the Northern Hemisphere spring starts on 1 March).