Manang is near Pokhara which gets highest amount of rainfall. Therefore, Manang gets rainshadows. Due to rain shadows Manang gets less rainfall.
The region above 300 north and lower 300 south of the equator is called tropical region.
South-east part of Pokhara is opened and it has got the mountain in the southern part. That is why Pokhara receives highest amount of rainfall in Nepal.
The moist westerly winds coming from Mediterranean Sea, Black Sea, Persian Gulf, etc. in winter there is a lot of snowfall in the high elevations. In summer, monsoon wind comes from the Bay of Bengal. So, eastern part receives more rainfall in summer.
In winter, land is cold oceans remains hot. Pressure on land is more than the pressure in the ocean. So, wind blows from land to ocean. This is called winter monsoon.
In summer, land is hot and oceans are cold. Pressure in the ocean is more than the pressure in the land. So, wind blows from the ocean to land. In this condition heavy rainfall occurs. This condition is summer monsoon.
Agriculture of Nepal depends on the monsoon as irrigation is done by the monsoon rain. Monsoon rain wets the ground and helps to maintain the level of underground water. Rainfall also helps to increse the river volume which is used to produce hydroelectricity in our country. So, monsoon rain is essential for Nepal.