梅雨Tsuyu

The East Asian rainy season, commonly called the plum rain (Chinese: 梅雨, méiyǔ; Japanese: 梅雨, tsuyu, baiu; Korean: 장마, jangma, Russian: затяжные, zatyazhnie), is caused by precipitation along a persistent stationary front known as the Meiyu front for nearly two months during the late spring and early summer between eastern Russia, China, Taiwan, Korea, and Japan. The wet season ends during the summer when the subtropical ridge becomes strong enough to push this front north of the region.

from East_Asian_rainy_season (Wikipedia) CC BY SA 3.0