Average Annual Precipitation for China. The tables below give yearly averages for rainfall plus snowfall at cities in China. Each place has a total for how many days of wet weather it usually gets a year and for the normal amount of precipitation.The calculation of days only includes the days when precipitation totalled at least one millimetre (0.04 inches).The annual amount of precipitation is an average of long-term historical weather data.ou can jump to a separate table for each section of the country: North China, Northeast China, East China, South Central China, Southwest China and Northwest China.