Solar terms reflecting temperature changes?

Millennium is the fifteenth solar term in the "twenty-four solar terms", and it is an important festival to reflect the temperature changes in nature. The ancients in China divided the Millennium into three stages: "The swan goose is coming; Second, wait for the mysterious bird to return; Three waiting birds raise shame. "It can be seen that the activities of birds are the most observed by the ancients in the Millennium solar terms, and the weather changes are expressed through the migration and storage of birds. _

The Millennium contains autumn, and this season is the most enjoyable. The crystal dew reflects poetic and picturesque, and the refreshing cool breeze blows all over the country from north to south, and the golden autumn begins. At this time, many areas in our country are already sunny and the clouds are light. There are both the desolate beauty of "falling leaves like waterfalls", the gorgeous beauty of "sunset and lonely Qi Fei" and the beauty of harvest everywhere. This is the beauty brought by the Millennium solar terms.

The climate of the Millennium solar terms is also changeable. In the meantime, the summer monsoon was gradually replaced by the winter monsoon, the cold air turned to attack, and the warm air gradually retreated. Cold air going south in batches will often bring a certain range of cooling. _

In many areas, the Millennium is the solar term with the largest temperature difference between day and night throughout the year. Take Mudanjiang City, Heilongjiang Province as an example. During the three days of the handover of the Millennium solar terms, from 198 1 to 20 10, the daily average maximum temperature was 29.6℃ and the daily average minimum temperature was 4.2℃, with a temperature difference of 25℃. People often ridicule that there are three seasons in a day, spring in the morning, summer at noon and autumn at night. Therefore, there is a proverb that "the white dew is autumn and the night is cool" to describe the situation that the temperature drops rapidly.