What are the phenological characteristics of summer solar terms?

Summer solar terms are the period with the most sunshine and the highest temperature in South China, the period with the richest precipitation, the most common thunderstorms and the most concentrated days with high temperature above 30℃ in the west of South China, and the period with the most frequent high temperature above 35℃ in the east of South China.

The summer heat is also the season with the most thunderstorms. There is a proverb that says, "Without a drop of lightning in the east, the west can't walk", which means that if there is lightning in the east in summer afternoon, it won't rain here. If lightning is in the west, it will come soon, and it is too late to hide. People often call the thunderstorm in summer afternoon "northwest rain" and describe it as "northwest rain, which falls on the driveway."

"Summer rain over the ridge" and "Summer rain over the cow's back" vividly show that thunderstorms often rain here and clear there, just like the poem of Liu Yuxi, a poet in the Tang Dynasty: "The east is sunny and the west is rainy, and the road is sunny."