The Corpmandel coast has more rainy months but less rainfall than the Konkan coast. Why?

Konkan coast faces on-shore S.W. Monsoon during summer. These moisture laden winds give heavy rainfall (more than 300 cm). But these winds do not give much rainfall on the Coromandel Coast as it lies in the rain shadow of Western Ghats. Coromandel Coast also receives winter rainfall from N.E. Monsoon, but on Konkan Coast these winds are off-shore and do not give any rainfall. Thus Coromandel Coast gets rainfall in both the seasons, but the total amount is less than that of Konkan Coast. Total rainfall at Chennai is 128 cm, but it is 180 cm at Mumbai.

Chennai gets most of rain from retreating monsoon in October and November. These winds after picking up moisture from Bay of Bengal give more rain on the east coast. Thus Chennai gets most of rain in winter when the fury of monsoon is over in most Parts of the country.