What can be inferred by combining rainfall and sunshine duration?

China Weather Network, weather forecast, enter the city you want to check, such as Rizhao. There is a city introduction in the lower right corner, which contains a general situation of climate and a detailed table: there are various meteorological elements such as monthly average temperature, precipitation, precipitation days and so on for 30 years, which are available in larger cities. The following is a climate introduction about sunshine (websites and forms-in fact, the map is not posted, and the review is time-consuming, so it may not pass): Climate. It belongs to the continental climate of warm temperate zone and semi-humid monsoon region, with four distinct seasons, no severe cold in winter, no intense heat in summer, mild and pleasant, and no typhoon landing record. Annual average temperature 12.6℃, winter average temperature 0.5℃, summer average temperature 23.9℃. The annual average precipitation is 813 mm; The frost-free period is 2 13 days. I hope I can help you.