Douzhi Xin, the sun reaches 105 degrees in the yellow meridian and intersects on July 6-8 of the Gregorian calendar every year. Heatstroke, which means hot, refers to small heat, which is not very hot yet. Although Xiaoshu is not the hottest season of the year, it is immediately followed by the hottest solar term of the year, the Great Heat. There is a saying in the folk that "Xiaoshu is a great heat, steamed on top and boiled on the bottom". Since Xiaoshu, many parts of China have entered the season with the most thunderstorms.
Xiaoshu begins to enter a hot summer, known as the "hot summer", which usually occurs between Xiaoshu and Chushu. It is the period of the year when the temperature is the highest, humid, and stuffy. The monsoon climate is the main characteristic of China's climate. In summer, it is influenced by warm and humid air currents from the ocean, resulting in high temperatures, dampness, and rainfall in many parts of China. Although it is sunny, hot, humid, and rainy during the summer heat season, for crops, the same period of rain and heat is beneficial for growth.