With a pleasant northern subtropical maritime monsoon climate, Shanghai enjoys four distinct seasons, with generous sunshine and abundant rainfall. Its spring and autumn are relatively short comparing with the summer and winter. The average annual temperature is about 17.6 ˇăC. The city has a frost-free period of some 300 days, and receives an annual rainfall of some 1,300 mm. However, nearly 50 percent of the precipitation comes during the May-September flooding season, which is divided into three rainy periods, namely, the Spring Rains, the Plum Rains and the Autumn Rains.
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