The solar term is the 11th solar term among the 24 solar terms, and it is the end of the noon month and the beginning of the non-month in the dry branch calendar. Dou refers to Xin, the sun reaches 15 degrees of the Yellow Meridian, and the festival is held from July 6 to 8 in the Gregorian calendar every year. Summer, which means hot, is a little hot, not very hot. It's getting hot, but it's not the hottest yet.

The summer heat begins to enter the dog days, and the so-called "hot in the dog days, cold in the March 9th". Dog days, usually between the light summer heat and the summer heat, are the time when the temperature is the highest, humid and sultry in a year. Monsoon climate is the main feature of China's climate. In summer, affected by the warm and humid air flow from the ocean, many places in China are hot, humid and rainy. Although the sun is fierce, it is hot, humid and rainy at this time, for crops, the same period of rain and heat is conducive to growth.