Rainfall in Tamil Nadu

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Rain in Tamil Nadu

Chennai’s monsoon is largely about the Northeast Monsoon, rains during October to December, with easterly winds starting from mid-October, precisely the usual onset that begins between October 10 to 20.
It is the Northeast Monsoon, also known as the ‘primary monsoon of Tamil Nadu,’ that brings sufficient rains to the state when all other states depend on the South West monsoon for rains that sets in from May, June and July.
The South West monsoon, after a prolonged summer, helps Tamil Nadu to maintain the ground water tables, it is the North East monsoon that elevates the table.
Tamil Nadu’s coastal districts get 60% of the annual rainfall and the interior districts get about 40-50% of the annual rainfall from the North East monsoon.