Traditional residential buildings in Gansu province

Zhejiang belongs to subtropical monsoon climate, with large annual precipitation, long rainy season and large roof slope, which is beneficial to drainage; Gansu province, which lives in the deep inland and is difficult to reach with warm and humid air, belongs to temperate continental climate with less annual precipitation and arid climate. Traditional houses are mostly flat-topped houses with earth walls.

So the answer is: Zhejiang has a large annual precipitation, a long rainy season and a large roof slope, which is conducive to drainage; Gansu has less annual precipitation and dry climate, and traditional houses are mostly flat-topped earth-walled houses.