Why is it always drizzling at this time of Qingming? Is there really a basis?

This is the solar term. Today is Tomb-Sweeping Day. It often rains around Tomb-Sweeping Day every year, and this year is no exception. From April 5 to this weekend, most areas in the south will be covered by rainy weather. Therefore, Du Mu, a poet in the Tang Dynasty, said in a poem: "There are many rains during the Qingming Festival, and pedestrians on the road want to die." Why does it always rain in the south of Tomb-Sweeping Day? First, when winter goes and spring comes, the influence of cold air gradually weakens, and the warm and humid air on the ocean begins to move northward actively. Before and after Qingming, cold and warm air often meet in Jiangnan, thus forming rainy weather. Second, in the spring in the south of the Yangtze River, there are many depressions. The clouds in the low pressure go fast, the wind is strong and the rain is urgent. Whenever the low pressure passes, there will be rainy weather. Third, there will be rainy weather around Qingming Festival.