The India Meteorological Department recognizes four seasons: Winter (Dec–Feb), Pre-monsoon/Summer (Mar–May), Monsoon (Jun–Sep), and Post-monsoon (Oct–Nov).

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

Meteorologists and climatologists divide the year into four 3-month periods based on the annual temperature cycle and our standard calendar. This system is consistent and makes it easier for scientists to compare seasonal data year-over-year. Spring: March, April, May Summer: June, July, August Autumn (Fall): September, October, November Winter: December, January, February Southern Hemisphere (e.g., Australia, Brazil, South Africa)