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The bulk of rainfall in India is concentrated over a few months starting from June to September. Because, during these four months, the rain-bearing winds called the South-West Monsoons, blow northwards in two streams from the Arabian Sea and the Bay of Bengal. These winds blow from the oceanic high pressure areas towards the low pressure areas of land and make a heavy rainfall.

Winds blowing from the Arabian Sea cause heavy rainfall exceeding 300 cm along the Western Ghats. Winds blowing from the Bay of Bengal cause heavy rainfall in the hills of Assam, Meghalaya, Mawsynram.