1. The Beginning of Summer in 2021 is on May 5, 2021, at 14:39, which is Wednesday, March 24th in the Xinchou Year of the lunar calendar.

2. The Beginning of Summer is one of the twenty-four solar terms, and it is also the beginning of the fourth month of the year. "Dou points to the southeast, and the dimension is Lixia. All things grow up here, so it is called Lixia." "Xia" in Lixia means "big", and "Lixia" means that the plants sown in spring have grown upright by this time. . Spring growth, summer growth, autumn harvest, and winter storage, summer is the best season for many crops to grow vigorously.

3. It is the beginning of summer, and everything is flourishing. Due to the vast territory of our country, with a large span from north to south, the natural rhythms vary from place to place. During the Beginning of Summer, only the area south of the line from Fuzhou to Nanling in our country enjoys a true summer of "green trees, thick shade, and long summer days, with buildings reflecting into the ponds"; while some areas in the northeast and northwest have just entered spring at this time. According to the classification standard of China's modern climatology (climate average temperature), summer begins when the daily average temperature rises steadily above 22°C.