Located in the inland of China, Lanzhou has the distinct features of semi-arid climate, characterized by dryness and abundant sunlight. Winter here is long and cold, with little snow and rain. Spring is transient with sharp temperature difference during a day. Summer is short and hot, but not sweltering. Autumn witnesses its rapid temperature drop. The average temperature is about 9.3 degree C. August and September are the best time for having a visit to Lanzhou for the agreeable weather and Lanzhou abounding in juicy and fragment Bailan melons at that time.