C is correct. The retreating south-west monsoons travel over Bay of Bengal, and gain moisture. While exiting the sub-continent, these winds cross the peninsula in north-east to south-west direction. As they pass over Tamil Nadu, the discharge their moisture as winter rains.

A is incorrect. South West Monsoon causes heavy rainfall in Kerala during June-August months, as it is the harbinger of rainy season in the country. they do not pass over the West coast on arrival

B is incorrect. Temperate cyclones occur 35 degrees to 65 degrees north of equator, but Tamil Nadu lies under 20 degrees latitude.

D is incorrect. Local air circulation occurs close to the equator, but Tamil Nadu is too far from the equator to be affected by it.