Climatic Variation of Rainfall and Wet Days in Zhejiang

Study is made of climatic variation of rainfall and rainy on a yearly, monthly and daily basis in terms of 1961–1999 data from 36 stations in Zhejiang Province. The results show that the annual rainfall increased but the number of wet days did not correspondingly increase. The number increased in July and August but decreased in the other months, and rainfall increased more obviously than the number of rainy days in July and August, leading to the fact that mean daily rainfall intensity was augmented. The decrease in the number of wet days occurred abruptly around 1978 and the number reduced greatly in September–December after the 1998s .