Which month does it start to get warmer?

It is generally warmer in late February, but the temperature in the northern region will not start to pick up until at least around Tomb-Sweeping Day. As far as the radiation intensity of the sun to the earth is concerned, the winter solstice is the smallest and the summer solstice is the largest.

In China's climatology, beginning of spring is usually defined as a day when the daily average temperature is stable above 10℃ every five days, which is inconsistent with the meaning of beginning of spring in the middle and lower reaches of the Yellow River.

In late February, only South China really entered the spring. But this division method is more practical. After beginning of spring, the temperature rose, and most parts of the country began a busy spring ploughing season.

Solar term analysis:

Twenty-four solar terms, a supplementary calendar established in the pre-Qin period and completely established in the Han Dynasty, is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year.

It divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with severe cold. It is not only a time standard promulgated by successive governments, but also a compass to guide agricultural production. People's compass for predicting cold, warm, rainy and snowy weather in daily life is the crystallization of the long-term experience and wisdom of Chinese working people.