Is Xiaohan the coldest day?
2021 Xiaohan is on January 5, 2021 in the Gregorian calendar.Folks often say that Xiaohan is very cold, but it is not the coldest day of the year.Because of my country’s vast territory and abundant resources, the temperature between the north and the south is very different.For the north, the period of the minor cold is the coldest, and for the south, the period of the major cold is the coldest.
Introduction to the Xiaohan solar term
Xiaohan is the 23rd solar term in the twenty-four solar terms, the 5th solar term in winter, the end of the sub-month of the stem and branch calendar and the beginning of the ugly month.Douzhizi; the ecliptic longitude of the sun is 285°; it meets on January 5-7 of the Gregorian calendar every year.Cold air is cold for a long time.Minor cold means the weather is cold but has not reached the extreme.Like Dahan, Minor, Dashu, and Chushu, they are all solar terms that indicate changes in temperature.The characteristic of the Xiaohan solar term is that it is cold, but it is not cold to the extreme.It only represents the beginning of the coldest day of the year.
Climatic characteristics of the minor cold solar term
When the ecliptic longitude of the sun reaches 285 degrees, the minor cold solar term begins.Cold means cold, and Xiaohan indicates the degree of coldness.During the minor cold solar term, the East Asian trough develops the most powerful and stable, the Mongolian cold high pressure and the Aleutian low pressure also reach the most powerful and stable, and the westerly trough ridge reaches the largest scale, which is combined with the strongest westerly wind intensity.The cold air cooling process of the minor cold solar term is frequent, but not many meet the cold wave standard.
There is a saying in the northern part of our country that "small cold beats big cold, it is not uncommon", which means that it is not uncommon for the minor cold solar term to be colder than the big cold solar term.Minor cold is generally in the period from "29th" to "39th".Minor cold is the coldest period of the year in northern my country.After the minor cold, the temperature of the major cold increases slightly.The coldest period in southern my country is on the fourth and nineth day, and the fourth and nineth day is colder than the third and nineth day.
The temperature comparison between the minor cold solar term and the great cold solar term
There are great differences in climate between the north and south regions of my country.According to our country’s long-term meteorological records, the minor cold solar term is colder than the major cold solar term in the northern region; but for most of the southern regions, the major cold solar term is colder than the minor cold solar term.According to climatic data statistics, the coldest period of the year in most northern parts of my country is mid-January (10th to 20th) of the Gregorian calendar each year; the annual minor cold solar term starts from January 5th to 7th, and a solar term is about 15 days., the mid-term is just within the minor cold solar term; therefore, for most of the northern regions, the minor cold is indeed colder than the major cold.But for most areas in the south, it is the coldest during the Great Cold solar term; the Great Cold solar term generally starts on January 20 (late January), which is the coldest time of the year in the south.
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