The Plum Rain season, known as "Meiyu" in Chinese, is a distinctive weather phenomenon occurring annually in East Asia. It primarily affects regions such as the middle and lower reaches of the Yangtze River in China, southern Japan, and South Korea. The name originates from the fact that this period coincides with the ripening of plums in early summer. However, due to the extremely high humidity during this time, which easily causes items to develop mildew, it is also commonly referred to as "Mould Rain."
Scientifically, the formation of Meiyu is closely related to atmospheric circulation. During June and July, warm and moist air masses from the ocean collide with cooler air descending from the north over the Yangtze River basin. This confrontation creates a stationary front, leading to continuous and prolonged precipitation. As a result, residents often experience persistent cloudy skies, frequent showers, and a suffocatingly hot and sticky climate. Relative humidity frequently exceeds 80%, making the air feel heavy and uncomfortable.
In our daily lives, the Plum Rain season brings both agricultural benefits and practical challenges. On the positive side, the abundant rainfall provides essential irrigation for crops like rice, ensuring a good harvest. However, the extreme moisture poses significant inconveniences. Clothes take forever to dry, and walls or wooden furniture may start to sweat and grow mold. To combat this stuffy environment, experts suggest utilizing dehumidifiers or the dry mode on air conditioners to maintain indoor comfort. Additionally, keeping living spaces well-ventilated and using waterproof containers for valuables can effectively prevent moisture damage.
Ultimately, while the Meiyu season requires us to take precautions against dampness and potential floods, it remains an integral part of the region's natural rhythm and cultural heritage.