What are the characteristics of autumn?

1, geese fly south: Every autumn, the cold climate in the north is no longer suitable for geese to survive, and geese will fly to the warm south.

2. When the rice is ripe, Huang Chengcheng's is like spreading gold all over the floor. There is a pond beside the rice field. There is a buttonwood tree by the pond. Pieces of yellow leaves fell from the tree. Some fell into the water, and the small fish swam to hide under it and used it as an umbrella. Some landed on the shore, and ants climbed up and ran back and forth, using this place as a playground.

3. In the orchard, apples are red, persimmons hang on the branches like small lanterns, and pear trees are full of fruits, like many small gourds saying, "Autumn is coming, autumn is coming!" Chrysanthemums are in full bloom in the garden, and so are osmanthus. Chrysanthemum combs its beautiful hair, and osmanthus also exudes a faint fragrance. Autumn is really a beautiful picture!

Autumn weather:

According to modern meteorology, autumn in north temperate zone is from August 23rd (summer) to165438+1October 20th (light snow). Autumn in the south temperate zone is from February 19 (rain in the northern hemisphere) to May 2 1 (xiaoman in the northern hemisphere).

At present, the division of the four seasons in China is often based on the change of temperature, and the division of "climate average temperature" by modern scholar Zhang Baokun is adopted. According to the weather average temperature method, there are two main criteria to judge autumn. First, the average daily temperature for five consecutive days 10℃-22℃ can be regarded as autumn and become a "short mark";

Second, the moving average temperature of five consecutive groups is lower than 22℃. A set of moving average temperatures refers to the average temperature of the day plus the average temperature of the previous four days divided by 5 to get the moving average temperature of five days, which is a "sliding scale". Entering autumn means that the hot weather has passed and it is beginning to cool down.