Typically occurs during the "high sun" months when the sun is directly overhead (e.g., May to October in the Northern Tropics; November to March in the Southern Tropics).
Occurs during the remaining months, often characterized by lower humidity and clear skies. Specific Regional Calendars
The seasons are reversed:
Always starts on the 1st of the month (e.g., March 1st for Spring).
The seasons are exactly reversed because the Earth is tilted on its axis. When the Northern Hemisphere tilts toward the sun, the Southern Hemisphere tilts away. Infographic: Meteorological and astronomical seasons - NOAA what are the seasons months
The astronomical definition is based on the position of Earth in its orbit. The year is divided by two solstices and two equinoxes. Under this system, the monthly assignments are fluid, as the specific dates of equinoxes and solstices vary slightly each year (occurring between the 20th and 23rd of their respective months).
Most of the world uses the meteorological calendar for simplicity, which splits the year into four 3-month blocks. Northern Hemisphere (e.g., US, Europe) Southern Hemisphere (e.g., Australia, Brazil) March, April, May September, October, November Summer June, July, August December, January, February Autumn (Fall) September, October, November March, April, May Winter December, January, February June, July, August Two-Season Regions (Tropical Zones) Typically occurs during the "high sun" months when
Temporal Segmentation of the Solar Year: A Comparative Analysis of Seasonal Month Classifications