Hangzhou , located in northern Zhejiang province, eastern China , south of Yangzi river delta, at the southern end of the Grand Canal of China, is the transportation center of the Yangzi river delta. Hangzhou belongs to the subtropical Zone . It has plentiful sunshine and abundant rainfall the whole year with an annual average temperature of 16.2 degrees Centigrade, average summer temperature of 28.6 degrees Centigrade , a nnual rainfall of 1435 millimeters, average relative humidity of 7 6 pen sent damp .