Qingming for the long summer, what does it mean that cattle and sheep don't leave the circle?

When Qingming is the same as long summer, cattle and sheep will not have enough to eat. Tomb-Sweeping Day and Changxia are both one of the 24 solar terms in China. This sentence is a common language in our country to judge the weather. It means that if the Qingming Festival in early March of the lunar calendar coincides with long summer in early April of the lunar calendar and both fall on the fifth day of the lunar calendar, then it is concluded that the drought is more serious this year, even the weeds are not tall, and the cattle and sheep are too thin to get on the ridge.