Why is it raining or cloudy in Tomb-Sweeping Day? I don't remember anything about sunshine.

Why is it raining or cloudy in Tomb-Sweeping Day?

First, when winter goes and spring comes, the cold air gradually weakens, and the warm and humid air on the ocean begins to move northward actively. Before and after Tomb-Sweeping Day, cold and warm air often meet in the south of the Yangtze River, resulting in rainy weather.

The second is the spring in Jiangnan, with a lot of low pressure. The clouds in the low pressure move fast, the wind is strong and the rain is urgent. Whenever the low pressure passes, there will be rainy weather.

Thirdly, before and after Tomb-Sweeping Day, there were a lot of water vapor in the atmosphere of the south of the Yangtze River, which easily condensed into Mao Mao rain at night. For these reasons, there are many rains during the Qingming Festival.