Tropical cyclones are phenomena that occurs due to differences in pressure and temperature over land and ocean. It occurs during advancing monsoon as well as retreating monsoon (October - November)
These disturbances affect the Eastern coastal regions -of India. The Eastern coastal region, mostly the Tamil Nadu coast, receives most of its rain from tropical cyclone.
The tropical cyclone originates over the Andaman sea and are often very destructive.
By causing heavy rainfall in one part of the country (mostly the Eastern coast), the tropical cyclone influences the distribution of rainfall in India.
Thus, it can be concluded that development of tropical cyclones is a distinguishing feature of monsoon.