Frostfall, the 18th of the 24 solar terms, is celebrated from October 22 to 24 on the Gregorian calendar each year when the sun reaches 210 degrees of yellow longitude. Frostfall, as the last solar term of autumn, is the transition from autumn to winter. Frost season, health care is particularly important, there is a folk proverb "a year to make up through, not as good as make up the frost", we can see the impact of this festival on us.

About the frost said: September in the middle of the gas and condensation, dew knot for frost carry on." Frost" means that the weather is getting colder, and the dew condenses into frost. China's ancient times will be divided into three frost: a wait for the jackal is sacrificed to the beast; the second wait for the yellow fall of grass and trees; the third wait for the stinging insects salty. Jackals began to capture prey, sacrificial beasts, beasts and sacrifices to the sky to report this also, square store and sacrifices to the meaning of autumn gold; the leaves on the ground withered and yellowed fall; stinging insects are all in the hole does not move not to eat, drooped his head into the hibernation state.

Climatic characteristics:

Frost Festival contains the meaning of the weather is getting cold, the beginning of frost. In the southern region of the latitude south, the average temperature is mostly around 16 ℃, and there are still three more seasons before the date of the first frost. In the river valley area of southern China, it will not see frost until mid-winter.

Of course, even in the same latitude, due to the altitude and topography of the different, advective layer of air temperature and humidity there are differences in the period of the first frost and the number of frost days will not be the same. At the time of frost, the cool autumn wind has blown to the flower city of Guangzhou. The average temperature in the northern northeast, eastern Inner Mongolia and most of the northwest has been below 0 ℃.