Advancing and retreating monsoon.

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Advancing Monsoon
Northern India is extremely hot from June to September. This creates low pressure over this region. During this time, the sea is cool; hence, high pressure prevails over it. This pressure difference causes the movement of winds from the high-pressure zone to the low-pressure zone. Winds moving over the Indian Ocean and the Arabian Sea are moisture-laden. On striking with hills and mountains, they cause rainfall in India. This whole process is known as advancing monsoon. Since these monsoon winds enter the Indian Peninsula from the southwest direction, this phenomenon is also known as southwest monsoon.
Retreating Monsoon
In the month of October, temperature starts falling in northern India. This weakens the low pressure, which ultimately fails to attract the southwest monsoon and, as a result, it starts retreating. The winds blowing from land to sea are dry; hence, they do not cause any rainfall. This season from October to November is referred to as retreating monsoon.

India receives most of its rainfall from southwest monsoon, but Tamil Nadu is an exception. It receives most of its rainfall in this season, as the retreating winds from the Bay of Bengal carry moisture and cause rainfall here.

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