Question

why does the rainfall decrease from the east to the west in the northern india

Answer 1

In northern India the garo, khasi,jayantia hills in the north west and they intercept the bay of Bengal branch of south west monsoons which then get deviated and being parallel to the aravallis doesn't bring rain in north east india

Answer 2

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$<b>$The Baynof Bengal branch of South-west monsoon moves towards north east carrying more moisture and they give heavy rainfall in this region. As they move towards west, they carry less moisture and many turns into snow due to Himalayan mountains resulting in decrease in rainfall in West.

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