1, first frost, no qi, petunia plough. (In first frost, the ears of rice were uneven and the harvest was not good. To delay Niu Gengdi again. )

2, south in spring, north in summer, no water to grind ink. It's southerly in spring, northerly in summer, and there may be a drought. )

3, early spring is good for pottery, and there are no grains of rice in early summer. (Summer comes early, but it dries up early, and the harvest is reduced in late winter. )

4. It rains in April, and there is no scorched soil in May. June burns down Po. (It rains every day, rainy in May, and long drought in June. )

Twenty-four solar term song, a small poem compiled for the convenience of remembering the twenty-four solar terms in the ancient Chinese calendar, has been circulated in many versions. Solar terms refer to the twenty-four seasons and climate, which is a supplementary calendar established in ancient China to guide farming, and is the crystallization of long-term experience and wisdom of working people in ancient China.

Because the lunar calendar in China is a kind of "yin-yang calendar", that is, it is based on the sun and the moon's movement, so it can't fully reflect the solar cycle. However, China is an agricultural society, and agriculture needs to strictly understand the sun's movement, so farming is completely based on the sun. Therefore, the "24 solar terms" that separately reflect the sun's movement cycle are added to the calendar as the criteria for determining leap months.