Why does the rainfall decrease from the east to the west in northern India?

Give reasons as to why:

Seasonal reversal of wind direction takes place over the Indian subcontinent.

Give reasons as to why:

The bulk of rainfall in India is concentrated over a few months.

Give reasons as to why:

The Tamil Nadu coast receives winter rainfall.

Give reasons as to why:

The delta region of the eastern coast is frequently struck by cyclones.

Give reasons as to why:

Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are drought-prone.