Kerala is blessed with plentiful rain, 54% to 85% of which is contributed by the monsoons. Monsoons bring to Kerala two rainy seasons-the southwest monsoon or the Edavappathi, bringing rains during June-September, and the north east monsoon or the Thulavarsham during October to December.
Kerala is directly exposed to the southwest monsoon but also receives rain from the reverse (northeast) monsoon. Rainfall averages about 118 inches (3,000 millimetres) annually statewide, with some slopes receiving more than 200 inches.
The north east monsoon season begins from the middle of October and lasts upto the end of February, though the rain associated with it ceases by December. The total annual rainfall in the state varies from 380 cms over the extreme northern parts to about 180 cms to the south.
The amount of rainfall decreases towards the south almost in proportion with the decrease in altitude of the Western Ghats. July receives the maximum rainfall with all meterological centres recording about 25 rainy days.
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