Analyze why there is so much precipitation in the rainy season in Nepal and its duration is so long.

Nepal is a landlocked country located on the southern slope of the Himalayas, with great differences in altitude, which can be divided into northern alpine climate, central temperate climate and southern subtropical monsoon climate.

Nepal's climate is divided into obvious dry season and rainy season. From April to September every year, the tropical monsoon in the Indian Ocean goes northward, carrying a lot of water vapor, which is blocked by the northern Himalayas and rises, and the temperature drops, and the water vapor condenses, forming the precipitation weather from May to September. Because the tropical monsoon continues to bring abundant water vapor, the rainfall has not decreased and it is often flooded. Until September, the monsoon recedes to the south, and the rainy season will gradually end.