The temperature after three or nine days.

Three or nine days generally refers to 27 days after the winter solstice, which is usually the coldest day of the year. That is, a few days after the Gregorian calendar 65438+ 10/0. Its temperature varies from place to place, and it may reach around -20℃ or even lower in North China. Northeast China is more likely to be around -30℃! The temperature in the south is higher, but it can often be as low as 10 degrees!