The traditional delicacy of Xiaohan Food Festival is cold food porridge.

Small Cold marks the official start of the winter season. The cold air accumulates for a long time and becomes cold. Xiaohan means that the weather is cold, but not to the extreme. The origin of the name of Xiaohan solar term is from "The Collection of the Seventy-Two Hours of the Moon Order" Interpretation: In the December festival, the cold at the beginning of the month is still small, so it is said that half of the month means it is cold. Xiaohan means that the cold air has accumulated for a long time and is cold. It means that the weather is cold but has not reached the extreme. It is the same as the major cold, minor heat, major heat and extreme heat. They are all solar terms that represent changes in temperature.

After the winter solstice, cold air frequently moves southward, and the temperature continues to drop. The temperature drops to the lowest during the minor cold and major cold of the year. In the Xiaohan solar term, the East Asian large trough develops the most powerfully and stably, the Mongolian cold high pressure and the Aleutian low pressure also become the strongest and most stable, and the scale of the westerly trough reaches its maximum, and in conjunction with the strongest westerly intensity, the Xiaohan solar term Cold air cooling processes are frequent, but not many reach cold wave standards.

Differences between North and South

In the north, the Minor Cold solar term is colder than the Major Cold solar term, but for most areas in the south, the Major Cold solar term is colder than the Minor Cold solar term. According to climate data According to statistics, the coldest time of the year in most of northern China is mid-January of the Gregorian calendar every year. The annual Xiaohan solar term starts from January 5-7. One solar term lasts about 15 days, and the middle period falls within the Xiaohan solar term. Therefore, for most areas in the north, the minor cold is indeed colder than the major cold, but for most areas in the south, it is the coldest during the major cold period.

The minor cold in northern China is colder than the major cold. This is because there is relatively little residual heat on the surface, which has been released by the minor cold. At this time, the days are still short and the nights are long, and the cold air is strong, causing the temperature to drop to It is the lowest. In the Great Cold, the solar heat increases slightly, so the temperature also rises slightly. In the south, the surface is relatively hot, and the remaining heat has not been released until the Xiaohan solar term, so the temperature does not drop to the lowest. In the Great Cold, the residual heat on the surface is dissipated, and the sky The ground is freezing, and the heat from the sun, which is slightly more than Xiaohan, will not have much effect at this time.