Hangzhou (30°E, 120°N) dominanted by monsoon climate, its annual mean tempe-rature is 16.4℃; the average January temperature is 4.4℃, while the average July temperature is 28.5℃. The annual mean precipitation is 1390.9 mm.This paper discusses the differences of climatic elements between the urban dis-tricts of Hangzhou and its suburbs, which are summerized in the following table.The urban heat island of Hangzhou occures every night throughout year. The maximum temperature in the center of the urban heat island is 5.6℃ higher than that of its surrounding countryside.