Hangzhou : climate is subtropical monsoon climate with four distinct seasons, warm and humid, full sun, plenty of rainfall. The annual average temperature is 16.2 ° C, average summer temperature of 28.6 ° C, 3.8 ° C mean temperature in winter. Frost-free period 230-260 days. 1435 mm average rainfall and average relative humidity of 76%. Best travel time : Four Seasons ages.