From the angle of agro-climate, this paper discusses the time and space distribution, formative cause and influence of both spring and autumn continuous rain on agroculture of Hubei province. On the basis of fuzzy classification, which was employed for the first time in this field of research, several different continuous rain areas have been defined and the time variation of these areas has been analysed. Finally, this paper points out that the weather system influencing the continuous rain mainly is the active cold air from the north, and has close relationship with 500 hpa circulation index...
