Rainfall patterns depend on

How are rainfall patterns decided ?

The occurrence of diffraction pattern depends on

Rainfall patterns across a particular area mainly depends on : (i) the prevailing wind patterns (ii) the pattern of population density in the area (iii) the amount of available groundwater in the area.

Assertion (A) : Heavy rain can cause flooding Reason (R) : Rainfall directly depends on temperature.

Describe in a brief the rainfall pattern in India.