Abstract: Monthly mean temperature, precipitation, sunshine hours for the years 1954—1990 in 47 stations over Guangdong Province are used. A principal component analysis and acluster anlysis are applied to classify the climate compositively.The results show:(1) when 5 regions are classified in all months, their patterns are various month by month.The classification patterns of each month in winter half year are more similiar to each other and more regular than that in summer half year.(2) The climatic classification of the year based on the data of natural synoptic seasons in Guangdong could be clustered as Southeast coastal, Southwest coastal, and Northwest inland regions.