about 80% rainfall occurs due to the monsoon in Nepal. so that is no remarkable difference between average annual rainfall and the average monsoon rainfall. like the pattern if annual rainfall, monsoon rainfall pattern also deceases from the east to the west. the western Nepal also receives higher monsoon rainfall compared to annual rainfall.
the summar monsoon originates in the bay of bengal and moves along the soithern flanks the Himalayas. thus, rainfall decreases from east to west. it is heavily concentrated in the southern part of Annapurna region.eastern Nepal and in the langtang area. the northern part of the mid west and far west receives less monsoon rainfall compared to other parts of the country.
the maximum rainfall has been recorded at lumle in pokhara. unlike mean annual rainfall, the north western part of the country also receives higher amount of rainfall in summers.