The story of the first frost.

It is said that before the uprising of Zhu Yuanzhang, the founding emperor of the Ming Dynasty, life was very bad, and he often slept in the wind and ate a meal. Once, during the first frost, Zhu Yuanzhang was so hungry and cold that he accidentally rolled down a hillside. Fortunately, he was blocked by a persimmon tree and was able to escape death. When Zhu Yuanzhang saw this persimmon tree, it was full of persimmons, golden and Huang Chengcheng's. He immediately ignored the pain and had a hearty meal.

Later, Zhu Yuanzhang joined the rebel army and soon became a leader. However, Zhu Yuanzhang was born at the grassroots level and did not know how to manage the army. He didn't manage the army well and developed slowly. On the day of the first frost, Zhu Yuanzhang had a dream at night. In the dream, an old man stood under a persimmon tree and said happily to Zhu Yuanzhang, "Persimmon gang, literati rule the country!" "

After waking up, Zhu Yuanzhang couldn't figure it out and gradually forgot the dream. Until the capture of Dingyuan, I met Li Shanchang, a famous person in Dingyuan City, and suddenly remembered that dream, so I reused this person. And Li Shanchang didn't live up to Zhu Yuanzhang's expectations, and soon managed the army in an orderly way, helping Zhu Yuanzhang develop rapidly.

After the founding of the People's Republic of China, Zhu Yuanzhang promoted the hero, wanted to make Li Shanchang the duke, and was afraid that other military commanders would not accept it, so he had a tentative plan. So he took his courtiers to the old persimmon tree that saved him that year and told them about his experience. Finally, when it comes to emotion, he took off his cloak and put it on the old persimmon tree. He said, "Persimmons save lives, and literati govern the country. Scholars should seal the double spirit." After hearing this, all the courtiers were moved and had no objection to the seal.

The next day, Zhu Yuanzhang wrote a letter to Li Shanchang, Xu Da, Chang Mao, Li Wenzhong, Sheng Feng and Deng Yu as the duke, headed by Li Shanchang. As a result, the saying that "persimmons save lives" gradually spread. In order to spend this cold solar term, people will eat persimmons when the first frost comes.

Characteristics of solar terms in the First Frost

The "first frost" solar term is characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. On the national average, the first frost is the season with the largest temperature difference between day and night in a year. After entering the first first frost solar term, the cold air activities affecting our country became more and more frequent, and the temperature difference between day and night increased rapidly. Especially in Jiangnan and South China, the temperature fluctuation is more and more obvious; Some areas in northwest and northeast China have shown the scene of "cold wind and fallen leaves" in early winter.

During the first frost period, it usually lasts from late June 10 to1early October 10. As dry and cold air gradually dominate the whole country, warm and humid air is marginalized, and many weather with characteristics of summer and early autumn exits, so the weather is relatively simple. Before and after beginning of winter, there were often strong winds and cool weather, and some places entered winter in a short time.