The poem of extremely cold weather in "Jiujiu Song" is

Three, nine, four, nine, walking on the ice.

Jiujiu Song is a folk proverb in China. In the traditional culture of China, 99 is the extreme number, the largest, largest and longest concept. Nine nines is eighty-one, which is the "maximum" number. People in ancient China believed that after the solstice on September 8 1 day, spring must have arrived.

To count nine is to count nine days as a "nine". Counting to "99" is the time when peach blossoms are everywhere, and adding "9" is "plowing cattle everywhere", which is * * * 90 days.

The widely circulated "99-year-old Quhan Song" said:

/kloc-no filming in 0/929, walking on the ice in 3949, watching willows by the river in 59/69, freezing the river in 79, swallows coming in 89, and cattle walking around in 99 19.

Extended data

The coldest period in winter usually occurs after the winter solstice. After beginning of winter, it means that it has entered winter, but it doesn't mean that it has started to be cold. So the heat stored on the surface in the second half of the year still has some energy, so it is not very cold. There is a folk saying that it is sunny in October, which refers to the bright, warm and comfortable "sunny" weather in Mengdongyang.

So in fact, early winter (Meng Dong) is generally not very cold, but with the passage of time, cold air frequently goes south and the temperature gradually drops. In winter, the so-called "cold on March 9 and April 9" usually means that it is not very cold before the winter solstice, but the really cold winter is after the winter solstice, especially on March 9 and April 9.

The date of winter solstice in Gregorian calendar every year is 65438+February 2 1-23, and 8 1 day of "99" is counted from the date of winter solstice, that is, the end of March (around the vernal equinox), "peach blossoms" and "deep spring and warm days" in Gregorian calendar. Due to the vast territory of China, the climate varies greatly from place to place, not all over the country.