The Indian monsoon is essentially a thermal circulation system driven by differential heating. During the peak summer months (April and May), the Indian landmass heats up rapidly. This creates an intense low-pressure area over the Northern Plains, known as the shift.
The summer season in India, which typically spans from March to May, is marked by scorching heat and rising temperatures. During this period, the sun's rays are almost perpendicular to the Earth's surface, resulting in intense heating of the land. This heat leads to the formation of a low-pressure system over the Indian subcontinent, which in turn, causes the air to rise and create a vacuum. Nature abhors a vacuum, and this void is filled by the moisture-laden air from the surrounding oceans, particularly the Bay of Bengal and the Arabian Sea. why maximum rainfall in india occurs after the summer season
Another factor contributing to the maximum rainfall occurring after the summer season is the phenomenon of "break and active" cycles of the monsoon. During the monsoon season, there are periods of heavy rainfall (active cycles) followed by periods of relatively dry weather (break cycles). These cycles are caused by the fluctuations in the monsoon trough and the movement of the low-pressure systems. The active cycles, which occur during July and August, result in heavy rainfall over the country, making these months the wettest. The Indian monsoon is essentially a thermal circulation