Winter month refers to the lunar month.

The winter month is November of the lunar calendar. "Winter Moon" is another name for November of the lunar calendar, also known as Gu Yue, Long Moon, Late October and Midwinter. If December of a year is represented by twelve earthly branches, then November is also called "Zi Yue" and "Jia Zi".

People often say "cold winter" refers to the three months before the Spring Festival. These three months are called:1October11/Leng Yue; 1 1 month 1 1 winter month; 1February 1 1 Day is the twelfth lunar month. Together, these three months are "winter months", the coldest three months of the year.

According to the lunar calendar, the solar terms of the winter solstice must appear in November of the lunar calendar. If there is an error, it will be adjusted by setting a leap month. If there is no leap month in a year, 1 1 month in the lunar calendar is the first 1 1 month in a year, so it is also called winter month because 1 1 month in the lunar calendar is the month of winter solstice in the 24 solar terms.

According to "Historical Records", "The best way for the Yellow Emperor to get a treasure tripod is to be strong in old age, to win the winter solstice, to win the discipline of heaven and to start all over again." This shows that as early as the Yellow Emperor era, the winter solstice was regarded as New Year's Day, which is why the 1 1 month of the lunar calendar was called the winter month.

In addition, the winter month is the November of the lunar calendar, also known as Gu Yue, Changyue, Late October and Midwinter. During the Zhou Dynasty, the solstice of winter was once Nian, that is, a year in a year and New Year's Day. Later, "the winter solstice is as big as a year", because "the winter solstice is a year", so the ancients called the month where the winter solstice is located the winter month. However, with the passage of time and the change of the calendar, the name of the winter solstice festival, which was once an annual festival, has gradually been forgotten by people.

The winter month is the month of the lunar calendar, and the winter solstice is the 22nd of the 24 solar terms.