Abstract

Rainy seasons in China are defined quantitatively and their characters are discussed in details by virtue of the daily rainfall data at 740 stations in China from 1951 to 2004, complied by China Meteorological Administration (CMA). It is found that the major rainy seasons begin earliest in central South China and latest in the Huaxi region, including Sichuan province, Southern Gansu province and Southern Shanxi province. Major rainy seasons in China persist for 20 to 70 days, with the rainfall amounts accounting for 30 to 60% of the annual rainfalls, depending on different regions. In East China, the major rainy season of monsoonal nature advances from south to north, whereas in West China, the major rainy season commences earlier in northwestern part than that in the southern part, with obvious local features.

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