What are the climatic characteristics of the great cold solar terms
in the 24 solar terms, the great cold is the last solar term, but people don't know much about the great cold. Let's learn about it today! So what are the climatic characteristics of the great cold solar terms? What is the solar term after? Next, let's follow the old yellow calendar of this issue and have a look!
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the climatic characteristics of the cold solar term. The cold time is the second half of January in the Gregorian calendar and the second half of December in the lunar calendar, which is the last solar term in the lunar year, meaning that the coldest time of the year has come, but the temperature gradually rises from low to high, which is often higher than the previous solar term, The average temperature is minus 2-4 ℃, the minimum temperature is generally minus 14-17 ℃, and the extreme minimum temperature can be reduced to more than minus 20 ℃. The lowest temperature in half of the years occurs in this solar term. The maximum depth of frozen soil is 30-40 cm, which is often the deepest solar term of frozen soil all year round. In the cold solar term, the atmospheric circulation is relatively stable, and the circulation adjustment cycle is about 20 days. During such circulation adjustment, there are often large-scale rain and snow weather and strong wind cooling. When there is a long wave ridge west of 80 degrees east longitude and a large coastal trough in East Asia, China will experience sustained low temperature under the control of northwest wind flow and the influence of continuously replenishing cold air.
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small cold and great cold are the periods with the least rain in a year. The annual cold solar term, the rainfall in most parts of South China is only slightly higher than that in the early stage, the rainfall in most parts of South China is 5 ~ 10mm, and the mountainous area of Northwest Plateau is generally only 1 ~ 5mm. South China is dry in winter, the water consumption of overwintering crops is small, and the contradiction between farmland water supply and demand is generally not prominent. However, "don't complain about the rain and snow in the bitter cold, and the snow will be left to the wheat next year". Under the condition of scarce rain and snow, timely watering in different areas according to different farming habits and conditions is undoubtedly very good for the growth of spring crops.
you may be interested in: four fires should be extinguished for health preservation in the great cold. What are the solar terms after the great cold: after the spring cold solar terms, the 24 solar terms will start a new seasonal cycle again from the spring solar terms. The great cold is the last of the twenty-four solar terms on January 20 or 21 of the Gregorian calendar. It reflects the change of temperature. According to the San Li Yi Zong, "the great cold is the middle, which is shaped in the light cold, so it is called great. Since the beginning of November 1, the Yin Qi goes out of the place, and the cold Qi is on the top, so it is called great cold." On the day of the great cold, the sun reached 300 degrees of the Yellow meridian. At noon, the solar shadow was measured with a guibiao. The shadow length was one foot one foot eight minutes, equivalent to 2.74 meters today. Compared with the longest time of the winter solstice, it was much shorter, indicating that the sun had obviously shifted northward. At night, the handle of the Big Dipper pointed to the ugly position, that is, north by East. At this time, it is December of the lunar calendar, also known as the ugly month and the twelfth month. The twelve message hexagram is a temporary hexagram. The hexagram has four Yin and two Yang, indicating that the underground Yang Qi has picked up.and
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