Why did the weather suddenly get hot after Tomb-Sweeping Day?

Qingming among the 24 solar terms is the solar term that begins when the sun runs to the longitude of the Yellow River 15 degrees. At this time, the weather is getting warmer, the temperature is rising, plants are sprouting, the sky is clear and bright, everything is thriving, and Qingming is clean. With the arrival of Tomb-Sweeping Day gas, the atmospheric circulation in East Asia turns from winter to spring. The weather has changed greatly, and unstable precipitation such as thunderstorms has gradually increased. "It rains in succession during the Qingming Festival" refers to the climate characteristics of the south of the Yangtze River. At this time, it is often cloudy and sunny, and abundant water can generally meet the needs of crop growth. What is annoying and can't be ignored is the harm of wet stains and insufficient light caused by too much rain. After Tomb-Sweeping Day, the climate and temperature rose rapidly, and the warm and humid air in southeast Fang Haiyang became active.