What are the climatic characteristics of Qingming? What is the impact on agriculture?

Qingming is in Tomb-Sweeping Day around April 5th, when the sun meridian is at 15 degrees. It is also a solar term representing phenology, indicating that the weather is fresh and clear, and the vegetation is thriving. The only thing that is both a solar term and a festival is Qingming. The traditional Tomb-Sweeping Day in China began in the Zhou Dynasty and has a history of more than 2,500 years. In ancient times, it was also called March Festival and Walking Festival. Later, the Cold Food Festival was integrated, and people's outdoor activities increased. As soon as Qingming arrives, the temperature rises and the rainfall increases, which is a good time for spring ploughing and planting. Therefore, there are agricultural proverbs such as "sow beans before and after Qingming Festival" and "planting trees is not as good as Tomb-Sweeping Day", which shows that this solar term is closely related to farming. In this season and climate, the whole country has entered the busy farming season, sowing early and middle rice, jointing wheat, flowering rape, strengthening field management, sowing corn and peanuts, etc. Farming in Northeast China includes: rice seedling raising, sweet potato seedling raising, cotton, corn, sorghum sowing and wheat jointing.