why the Tamil Nadu coast remains dry during this season. There are two factors responsible for it: The Tamil Nadu coast is situated parallel to the Bay of Bengal branch of southwest monsoon. It lies in the rainshadow area of the Arabian Sea branch of the south-west monsoon. Characteristics of Monsoonal Rainfall Rainfall received from the southwest monsoons is seasonal in character, which occurs between June and September.
Monsoonal rainfall is largely governed by relief or topography. For instance the windward side of the Western Ghats register a rainfall of over cm. Again,