Looking at the annual variation in average monthly precipitation, there are some months with more and less precipitation that are clearly defined, and the rainy season refers to the period with the most precipitation among these. Broadly speaking, there are two types of rainy season: those in the summer and those in the winter. In savanna climates and tropical monsoon climates such as India and Southeast Asia, the rainy season with most precipitation (monsoon) occurs in the summer. On the other hand, in temperate winter rain climates, the rainy season occurs in winter due to the influence of fronts and low pressure systems. In Japan, the difference between the rainy season and the dry season is somewhat unclear, but on the Pacific side there is the rainy season, the autumn rains, and the typhoon season, and on the Sea of Japan side there is also a rainy season with relatively clear snowfall in winter. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
月平均降水量の年変化をみると,降水量の多い月と少ない月が明瞭な場合があり,雨季はそのうちで降水量の多い期間をいう。大別すると夏が雨季の場合と冬が雨季の場合の二つがある。サバナ気候や,インド,東南アジアなどの熱帯季節風気候では,夏に降水量の多い雨季(モンスーン)となる。他方,温帯冬雨気候では冬に前線や低気圧の影響を受けて雨季となる。日本では,雨季と乾季の差はやや不明瞭であるが,太平洋側では梅雨期と秋の秋雨と台風期に,日本海側ではそれらに加えて冬季に比較的はっきりした降雪という雨季がみられる。
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