late May. Temperatures in the Summer vary from 32 degrees Celsius and can go up to 41 degrees Celsius. There is no particular Monsoon season for Kalpakkam as rains are unpredictable here, although there is heavy rainfall in the months of October and November, usually turning into a storm. The coolest months are December and January. A study by the Madras Atomic Power Station(MAPS) revealed that the pollution in Kalpakkam is very low, which when compared to the neighbouring city Chennai is 50 times less.