In traditional customs, entering cold weather begins with heavy snow, right?

No, it starts counting after the winter solstice. The winter solstice is the first day of September, nine days is September, then nine days is September, and so on. Until the 81st day of "999", the weather will be warm when "nine peach blossoms bloom". In fact, it is "99-99, plowing cattle everywhere"-90 days, which is 9 days.

"The Ninth Five-Year Plan" is a suitable solar term in northern China, especially in the middle and lower reaches of the Yellow River. It started from the day when it met Ren in winter and entered the "number nine", commonly known as "cross nine". From then on, it was called "Nine" every nine days. After nine "nines", it's just 8 1 day, and then spring blossoms.

In ancient times, especially in northern China, the conditions for working people to keep warm from the cold were simpler than their descendants. Winter is regarded as a threat and punishment, which directly affects people's mood and even makes them feel that winter is inexplicably long. At that time, in order to survive the long winter, the people of China invented the method of "counting nine" to pass the time, so as to alleviate the psychological crisis under the threat of winter. At that time, it was a carefree state to count nine around your family.