When is the coldest time in winter?

During the severe cold solar term, the atmospheric circulation is relatively stable, and the adjustment period of circulation is about 20 days. When this circulation is adjusted, there will often be a wide range of rain and snow weather and strong winds to cool down. When the west of 80 degrees east longitude is a long wave ridge and East Asia is a coastal trough, under the influence of northwest wind and constantly supplemented cold air, China will have a sustained low temperature.

Like slight cold, great cold is also a solar term indicating the degree of cold weather. In some parts of China, severe cold is not as cold as slight cold, but in some years and a few coastal areas, the lowest temperature in the whole year will still appear in the severe cold solar terms.

Extended data:

Great cold custom:

1, eat glutinous rice, that is, on the day of the great cold solar term, the ancients were popular to eat food made of glutinous rice.

2, drink porridge, that is, as the saying goes, "drink Laba porridge." The custom of drinking porridge on the eighth day of the twelfth lunar month has a long history. This porridge is made of rice, beans, dates, lotus roots, peanuts, medlar, chestnuts, nuts, longan, raisins and walnuts.

3, dust removal, also known as "getting rid of the old" and "dust removal", is a kind of general cleaning: "Every family paints the wall and sweeps away the ominous" to sweep away the bad luck; On the contrary, "the twelfth lunar month does not remove dust, and the plague will be recruited in the coming year." Dust removal is generally carried out on the 23rd and 24th of the twelfth lunar month, that is, on the day of "offering sacrifices to the stove". Avoid words when removing dust, and pay attention to "silence is better than sound".