Southwest Monsoon:
1. Period of Southwest monsoon is from March to May.
2. Tamil Nadu is located in the rainshadow region for the wind hence gets only less rainfall.
3. Rainfall decreases from West to East,
4. Coimbatore Plateau,Kanyakumari and Tirunelveli districts receives 50 – 100 cm rainfall during this period.
Northeast Monsoon:
1. Period of Northeast Monsoon is from October and lasts till mid – December.
2. 48% of annual rainfall to Tamil Nadu is from this wind.
3. It is the rainy season for the districts of Tamil Nadu.
4. Coastal districts get nearly 60% of annual rainfall and interior districts get 40 – 50 cm rainfall.
