What is the most striking meteorological feature in autumn?

The characteristics of autumn climate: the altitude angle of the sun is getting lower and lower, and the temperature is getting lower and lower; The autumn wind is cool, the summer heat is gone, the fruits are covered with branches, and the fields are golden.

Northeast China is the earliest place where autumn begins in eastern China. In autumn, the cold air in the north is constantly invading, but its power is not very strong. Autumn weather often forms in northern China, and continuous autumn rain often appears in West China. The temperature will gradually drop in autumn, but it is generally slower than in winter. Due to the difference of dry and wet conditions, there will be cold and rainy weather conditions or dry and cool weather conditions in different regions. In the cold late autumn, due to the large temperature difference between day and night, the water vapor transpiration during the day will condense at night, either dew or frost.