Why does rainfall takes places in winter in province no 4 of nepal

for starters it's based on your location

During winter months the peak of the mountains have ice or snow and clouds are blanketing all the alps and mountain sides. The influence of Himalaya mountain ranges might be one factor to keep cloud presence almost all day during winter season in your region. Those clouds at lower elevation are so dense and precipitation has high probability. remaining clouds that pass through that mountain is not as cold as on the east side, Those clouds causes rainfall on the west part of that mountain.

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