​The months of October and November are known for retreating monsoons.
By the end of September, the southwest monsoon becomes weak as the low-pressure trough of the Ganga plain starts moving southward in response to the southward march of the sun.
The monsoon retreats from the western Rajasthan by the first week of September.
It withdraws from Rajasthan, Gujarat, Western Ganga plain and the Central Highlands by the end of the month.
By the beginning of October, the low pressure covers northern parts of the Bay of Bengal and by early November, it moves over Karnataka and Tamil Nadu.
By the middle of December, the centre of low pressure is completely removed from the Peninsula.