How accurate is the rain in Tomb-Sweeping Day?

Mourning day, drizzle like tears; Pedestrians on the road want to die. "Whenever Tomb-Sweeping Day is angry, this catchy poem, which has been circulated for thousands of years, comes out with a sense of existence. How accurate is this most popular Qingming weather label? Where is the most accurate?

0 1 most of the "continuous rain" in the south occasionally "rain mouth"

Qingming is not only a festival for hiking and grave-sweeping, but also a solar term. In terms of solar terms, the general weather in Tomb-Sweeping Day is around April 5-April 19, that is, the first half of April.

In order to verify the accuracy of the rainy season in Qingming Festival, Data Emperor extracted the rainfall data of representative cities in the south of Tomb-Sweeping Day during 196 1-20 16. On15th day of Tomb-Sweeping Day gas every year, the day with rainfall above 0. 1mm is regarded as rainy day, and the probability of rainy days in the south during Tomb-Sweeping Day gas period is examined.