Why does it always rain in Guangzhou? What is the ratio of rainy days to sunny days in a year?

There is more rain in April, and there is an old saying that we should plant melons and beans before and after Qingming. It means that too much rain will easily soak the seeds during the Qingming Festival. This is not the time to sow. It is unwise and futile to sow at this time. It's good to grow melons and beans, but the grain is not harvested. In May, there will be less rain and summer will begin. The rainy days in Guangzhou are relatively few in a year, generally concentrated in March-April, and the proportion has not yet been counted.