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Why does the rainfall decrease from the east to the west in Northern India?
Why does the rainfall decrease from the east to the west in Northern India?
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The amount of rainfall decreases from east to west in Northern India because of the progressive decrease in the humidity of the winds. As the moisture-bearing winds of the Bay of Bengal branch of the southwest monsoon move further and further inland, they exhaust most of the moisture they carry along with them.
The Bay of Bengal branch of the monsoon winds moves towards northeast and return westwards covering the northern plains. While they move towards west their moisture contains tends to reduce with subsequent rains. Hence the rainfall decreases from east to west in northern India.