Will it be cold after Tomb-Sweeping Day?

Generally, it will be cold after Qingming. As the saying goes, "It's ten days after Tomb-Sweeping Day", which means that there are still ten days in Tomb-Sweeping Day, and the temperature will be repeated, so we should pay attention to keep warm. Generally, in Tomb-Sweeping Day, there will be a wave of late spring cold. After the late spring cold, the weather will start to pick up.

Late spring cold refers to the weather phenomenon that the temperature rises rapidly in early spring (generally refers to the end of February and the beginning of March), but the temperature in late spring cold (generally refers to April) is lower than normal. Long-term rainy weather or frequent cold air intrusion, or under the control of continuous cold and high pressure, strong radiation cooling in sunny nights is easy to cause late spring cold. The climate is changeable in early spring. If the cold air is strong, the temperature can drop to below 10℃, even in rainy and snowy weather.

At this time, it is often sunny during the day, which makes people feel that "warm wind makes tourists drunk", but it is chilly in the morning and evening, which makes people feel "chilly in spring". This unpredictable "fickle" weather is what is commonly called "cold spring". Generally speaking, after January and beginning of spring, the weather began to get warmer, but the feeling was not obvious. After the vernal equinox, the direct point of the sun crossed the equator and entered the northern hemisphere, and the northern hemisphere entered the summer half year, and the temperature rose rapidly. After Tomb-Sweeping Day, this change is more obvious. As the saying goes, "a spring rain is warm" is the truth.

In spring, the northern hemisphere of the earth began to tilt towards the sun, receiving more and more direct sunlight, so the temperature began to rise. In spring, plants begin to sprout and grow, and many flowers bloom. Hibernating animals wake up, many animals with eggs for the winter hatch, and birds begin to migrate, leaving the wintering ground for breeding grounds. Many animals are in estrus during this period, so China also calls spring the season of "the revival of everything".

The changes of temperature and biology in spring also affect people's psychology and physiology. Spring is the first season in a year, and there are many ways to divide the four seasons. In daily life, people usually regard the arrival of beginning of spring solar terms as beginning of spring, and beginning of spring is defined from the perspective of astronomy. Meteorological departments generally divide the solar calendar into four seasons, and March-May is spring. However, this division method has a disadvantage. According to this method, March belongs to spring in China. At this time, although the Yangtze River basin is pink and green, and the spring is full, Heilongjiang Province is still ice and snow, and Hainan Island has already had the breath of summer.