What does weather 999 mean?

The weather 999 means three to nine days.

Sanjiu Day refers to the third cold day from the winter solstice on Renri, which is the coldest period of the year. Taking the winter solstice as the Ren day as the starting point, every "nine days" is counted as one "nine", the first nine days is called "one nine", the second nine days is called "two nines", and so on.

As the saying goes, "Hot comes in the third volts, cold comes in the 39th day." The coldest period of the year is from the "three to nine days" to the "fourth nine days". Counting nine cold days means counting from the winter solstice on Ren day (the day of the stems and branches), counting one "nine" every nine days, until the eighty-one days of "nine nine", "nine peach blossoms bloom", when the cold air is gone , the weather is getting warmer. There is also a saying that "nine-nine and nine-nine, plowing cattle are everywhere". After "nine-nine", "spring is deep and the sun is warm", and the spring plowing season has arrived. Due to the vast territory of our country, the climate varies greatly from place to place, and this is not the case across the country.