Xiaohan is the 23rd solar term in the solar term. The arrival of Xiaohan indicates the arrival of a really cold winter. What are the characteristics of the minor cold term in 2019? What's the date of the minor cold term in 2019? Let's have a look.
Small cold or big cold
Cold is generally colder than cold.
There is no exact answer to this question. Historical data statistics show that the situation is different in different places and years. Generally speaking, the average minimum temperature of the northern cold term is lower than that of the lesser cold term; In the south, on the contrary, climate experts believe that there are many factors affecting whether a place is cold or not. In a certain year or a certain area, whether it is cold or not should be specifically analyzed. In addition, the climate is changing. The statistical data in recent decades can only reflect the situation in recent period, and the climate situation in recent period is not necessarily the same as that in 2000 years ago.
Temperature and weather characteristics of the mild cold solar term
The characteristics of cold climate: a sharp drop in temperature in China
When the sun's yellow longitude reaches 285 degrees, the small cold solar term begins. Cold means cold, and small cold means the degree of cold.
The coldest area in the middle of winter in China is the north of Heilongjiang Province. The lowest temperature is around - 40 ℃. It's freezing and drips into ice.
The average temperature of Beijing is generally above - 5 ℃ and the extreme minimum temperature is below - 15 ℃; in the north of Northeast China, the average temperature is around - 30 ℃, the extreme minimum temperature can be as low as - 50 ℃, and the average maximum temperature in the afternoon is no more than - 20 ℃. In Heilongjiang, Inner Mongolia and Northern Tibet Plateau, the average temperature is above - 20 ℃ and below - 10 ℃ respectively. To Qinling and Huaihe River, the average temperature is about 0 ℃, there is no seasonal frozen soil in the south of the line, and there is no obvious overwintering period for winter crops. At this time, the average temperature in the south of the Yangtze River is generally above and below 5 ℃, although the fields are still full of life, there are also cold air southward, causing certain harm.
The characteristics of cold climate: the south is often frozen
In the south of China, it is warm in winter. In January in the middle of winter, there is often frost and snow. The lowest temperature is about - 10 ℃. However, the lowest temperature in the north of South China is rarely lower than - 5 ℃, and the low temperature below 0 ℃ in the south of South China is even less.
The lowest winter temperature in South China is not low, which is conducive to production and diversified management. The minimum temperature is no lower than - 5 ℃ and the annual temperature is higher than 15 ℃. Most areas in South China can meet the requirements, and there are almost all kinds of subtropical plants. Only so, the unique climate conditions should be a very important factor.
Low altitude River Valley is the warmest place in the winter in most parts of southern China. The average temperature in January is about 12 ℃, and only a very young population may have a low temperature below 0 ℃. In addition, the temperature inversion effect is very significant, so tropical fruits such as banana and mango can grow well.
What does Xiaohan mean
1、 Xiaohan, the 23rd of the 24 solar terms. When the sun reaches the 285 & deg; longitude of the Yellow River, the time of slight cold is about January 5-7 of the solar calendar every year. In ancient China, people mainly looked at the 24 solar terms of the lunar calendar to guide agricultural cultivation.
2、 As the saying goes, "the cold is in the third nine days". The third nine days are mostly from January 5 to 17, which is exactly within the solar term of the small cold. The small cold marks that we will enter the coldest day of the year. But it's just a general rule. In a few years, the severe cold may be colder than the minor cold.
3、 Third wait: Yanbei township: the ancients believed that the wild geese in the migratory birds moved along the Yin and Yang. At this time, the Yang had moved, so the wild geese began to move northward.
Magpie begins to nest: at this time, magpies can be seen everywhere in the north, and feel the Yang and start to build nests. Pheasant: the pheasant calls when it senses the growth of Yang.