The first frost is frosting with the beautiful pictures of solar terms. However, due to the wide latitude distribution in China, the weather situation is more complicated.
Pictures of the first frost solar terms 1
The first frost is one of the 24 solar terms, which falls on the 23rd or 24th of the Gregorian calendar 10 year 10. At this time, the first frost generally appeared in the Yellow River basin in China, and most areas were busy planting crops such as wheat and wheat.
The first frost solar term means that the weather is getting colder and the first frost appears. It is the last solar term in autumn, which also means that winter is about to begin. Health care is particularly important in the first frost season. There is a folk proverb that "it is better to make up the first frost once a year", which shows the influence of this solar term on people.
First frost solar terms Figure 2
Yizhoushu Zhou said: "Autumn and March are empty: summer, autumn equinox, first frost." "Mandarin Zhou Yuzhong": "See the fire and cool breeze to stop the cold." "The History of the Three Kingdoms Wu" notes: "As the saying goes, after the first frost, the breeze comes first, and people should have a cold heart." Wei Wei's "Oriental" Chapter 15: "In the solar terms, there are several frosts here before the first frost."
People call the last frost after spring "the last frost" and the first frost after autumn "the first frost". The so-called "frost-free period" refers to the period between the "final frost" and the "first frost" when there is no frost.
First frost solar terms Figure 3
The longer the frost-free period in a year, the better for crop growth. Due to the different climatic conditions every year, the first frost and the last frost appear early and late, and the frost-free period is different every year.
China has a vast territory, and the "frost-free period" varies greatly from place to place. Because most of China is located in temperate zone, it is often attacked by cold air. Except Hainan Island, Yunnan Province, Taiwan Province Province and other parts of the South China Sea Islands, there is a wide range of frost. According to statistics, the average first frost in Northeast China is in mid-September, the final frost is in late April, and the frost-free period is less than 150 days. The first frost in North China is in the middle of 10, and the last frost is in early April, lasting about 200 days. The Yangtze River Basin lasts about 250 days from April to165438+1October. The frost-free period in South China is more than 300 days, and some years are frost-free.
First frost solar terms Figure 4
If the human body feels 25℃ as the standard, the national average temperature before and after the first frost is 10℃ ~ 20℃, the highest temperature cities are Sanya, Beihai and Fuzhou, and the average temperature is around 25℃. The cities with the lowest temperature are Harbin, Changchun, Yinchuan and Hohhot, and the average temperature is around 1℃.
Therefore, it can be judged that even the city with the hottest first frost will not make people feel hot, but generally feel comfortable, while parts of the north have entered cold weather.
First frost solar terms Figure 5
The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter.
First frost solar terms Figure 6
Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different. In the first frost season, the cool autumn wind blew to Guangzhou, the flower city. The average temperature in northeast China, eastern Inner Mongolia and most parts of northwest China has been below 0℃.
The next page is even more exciting, "The first frost and solar terms are beautiful with words"