Kerala is at the southern most tip of india & the monsoon winds blowing from the sea first make landfall at kerala & then move northward the phenomenon of retreating monsoon where the monsoon winds withdraw from the land of the sub continent is also last to leave kerala owing to its proximity to the addition kerala lies in so much to the south that it almost fall in the tropical belt that sees heavy rainfall in the year.
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Bcoz monsoon winds came from sea and kerela is on southern tip of India hence it recieves high rainfall
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