Rainfall/ Precipitation in Beijing, China. 1  Beijing receives on average 576.9 mm (22.7 in) of rainfall per year, or 48.1 mm (1.9 in) per month.2  On average there are 66 days per year with more than 0.1 mm (0.004 in) of rainfall (precipitation) or 5.5 days with a quantity of rain, sleet, snow etc. per month.ainfall/ Precipitation in Beijing, China. 1  Beijing receives on average 576.9 mm (22.7 in) of rainfall per year, or 48.1 mm (1.9 in) per month.