It is because it is located in the slopes of the khasi hills.the warm moist winds from the bay of bengal helps in concentrating its mawsynram receives the highest rainfall in the world.
1 5 1
Mawsynram receives the highest rainfall bcoz it is located in northeastern part of india and covered by mountains from three sides.when monsoon winds come from the bay of Bengal it gets trapped and shower there .
hope it helps......................
1 4 1