Why do you feel that the Japanese weather is always clear in Wan Li?

Japan is an island country with a long and narrow terrain and a relatively low average terrain. Mainly hills and mountains, surrounded by the sea, the climate is mainly maritime (a temperate monsoon climate). Most of the water vapor at sea can pass through the land of Japan without stopping. Take Shanghai as an example. Shanghai is a plain area, and the water vapor on the sea passes quickly, so no rainfall can be formed. However, after Shanghai, the water vapor began to be blocked and the precipitation slowly formed (light rain). It has already formed after a little rain. At the same distance, most of the water vapor has crossed the land and floated on the sea in Japan, and very few of it can form rain in Japan.