January and July are, respectively, the coldest and hottest months during the year. Zibo enjoys 180 to 220 frost-free days and the average annual hours of sunshine are 2542.6 to 2832.6. The annual average precipitation of Zibo is 25.2 inches (640.5 mm). [7]Demographics As of 2006, 4,181,260 people lived in Zibo, of which 2,102,819 were male and ...