Question.
Why does the rainfall decrease from the east to the west in Northern India?
( Chapter - 4 Climate, Cass 9 NCERT Contemporary India -I )
Answer.
Most of the monsoon rainfall in northern India is received from the Bay of Bengal branch of monsoon winds. The amount of moisture in the branch of the monsoon winds of the Bay of Bengal decreases from east to west [as they move away from the sea], due to which the rainfall in North India decreases from east to west.
Following are the visible effects of the decrease in rainfall from east to west in North India:
The city of Kolkata is located in the eastern part of the northern plains, and the annual rainfall in the city of Kolkata is approximately 119 cm while Delhi is located in the western part of the northern Indian plains, the annual rainfall in Delhi is approximately 56 cm.
The annual rainfall in Patna is around 105 cm whereas the annual rainfall in Prayagraj is around 76 cm as Patna is situated on the eastern side of Prayagraj.
Therefore, we can say that rainfall decreases from east to west in North India because the amount of moisture in the monsoon winds decreases from east to west.
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