Why is beginning of spring colder than winter?

Because of the large temperature difference between day and night in beginning of spring, and the cold in late spring before the temperature rises, sometimes beginning of spring is colder than winter.

Beginning of spring is the first of the 24 solar terms. Standing means "start"; Spring represents warmth and growth. Twenty-four solar terms were originally formulated on the basis of "variable stars". When the bucket handle of the Big Dipper points to the shade, it is beginning of spring. At present, solar terms are determined according to the longitude of the sun. When the sun reaches longitude 3 15, it will be the beginning of spring, and the festival will be held from February 3 to 5 of the Gregorian calendar every year.

Beginning of spring marks the end of the winter when everything is hidden and begins to enter the warm and sunny spring. In nature, the most striking feature of beginning of spring is that everything is beginning to show signs of recovery.

As far as beginning of spring is concerned, you can obviously feel the breath of early spring in the Tropic of Cancer (Huangchi Jiao Jiao) and its south. Due to China's vast territory, large span between north and south, and different natural rhythms, the "beginning of spring" in many areas is only a prelude to spring, and everything has not yet recovered, and it is still in the winter when everything is hidden.

Climate change in early spring.

In early spring, westerly jet, the southern branch of East Asia, began to weaken, while the strength and location of westerly jet, the northern branch of East Asia, remained basically unchanged. The Mongolian cold high and Aleutian low are relatively strong, but in the interval affected by strong cold air, the frequency of southerly wind increases, accompanied by obvious warming process.

Since the solar terms in beginning of spring, the time series has entered the spring. In nature and people's minds, "spring" means warm weather and the revival of everything. Spring has begun. In nature, the most striking feature is that everything is beginning to show signs of recovery.

The dividing line between winter and spring in beginning of spring and China (when the average temperature reaches 65,438+00 degrees Celsius for five consecutive days, it is regarded as spring), from Guilin, Guangxi to Ganzhou, Jiangxi. In the area south of this line, beginning of spring sometimes smells like spring, but 93% of the land in China is still winter, while in Heilongjiang, it often welcomes spring in the long summer, Grain Rain.