Cold dew in this solar term, geese move south in a word or herringbone queue; In the cold late autumn, all the birds disappeared. The ancients saw a large number of clams suddenly appearing on the seashore. The stripes and colors of shells were very similar to those of birds, and they thought they were birds. The third stage of "Chrysanthemum begins to blossom" means that the chrysanthemum has opened in a large area at this time.
Climatic characteristics of cold dew
Cold dew is a solar term in late autumn. Cold dew geese fly to the warm south and chrysanthemums are in full bloom. Compared with the "white dew" a month ago, the temperature is lower, the dew is more, and it is chilly. After the cold dew, the cold air in the north is rampant, and the weather is often warm during the day and cool at night, with maple red and apricot yellow, which is a scene of late autumn. 10℃ isotherm moves southward to Qinling and Huaihe rivers, but generally falls below 0℃ to the north of the Great Wall. In most years in the capital Beijing, you can see the first frost at this time.
After entering the cold dew solar term, the invasion frequency and intensity of cold air in the north will increase. It is common for the temperature to drop by 8℃ to 10℃ after the autumn rain brought by a strong cold air.