South Bengal, including the Gangetic plains and the coastal delta (districts like Kolkata, North and South 24 Parganas, Howrah, and Hooghly), receives moderate rainfall compared to the north.
The western plateau districts (such as Purulia and Bankura) and parts of the northern plains (like Nadia) often record the state's lowest annual rainfall, sometimes dipping toward 1,250 mm . 2. Monthly Distribution and Seasonality average rainfall in west bengal
The southern plains, including Kolkata and surrounding districts, receive a lower average of roughly 1,411 mm to 1,533 mm per year. South Bengal, including the Gangetic plains and the
This region, including districts like Darjeeling, Jalpaiguri, and Alipurduar, is the wettest in the state. It receives an average of 2,486 mm to over 3,300 mm annually. North and South 24 Parganas