What are the characteristics of autumn?

Generally speaking, in autumn, the solar altitude angle decreases and the temperature decreases; The autumn wind is cool, the summer heat is gone, the fruits are covered with branches, and the fields are golden.

Autumn is the harvest season, and many plants mature in autumn. In the subtropical region of the northern hemisphere, the temperature in autumn is obviously lower than that in summer. As the temperature drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter. Panicum miliaceum will come to the end of his life, wither and die.

Autumn solar terms:

Beginning of autumn: The sun is located at longitude 135 degrees, and will intersect on August 7-9. Rainfall, storm, temperature and humidity tend to decrease or decrease.

Summer: The sun is located at the longitude of the Yellow River 150 degrees, and it is in the internode on August 22-24. The summer heat ended here, and the rainfall gradually decreased.

Millennium: The sun is located at 0/65 degrees of the yellow longitude/kloc, and the solar term passes on September 7-9. Dry, the temperature difference between day and night is large, and the weather gradually turns cold.

Autumnal Equinox: The sun is located at 0/80 degrees of the Yellow Meridian/KLOC, and the solar term passes on September 22-24. The sun shines directly on the equator, and the length of day and night in the northern and southern hemispheres is equal. The temperature difference between day and night gradually increases, and the temperature drops day by day.

Cold dew: The sun is located at the longitude 195 degrees, and the node of 101October 8-9. The temperature drops, there is less rain and dryness, and the morning dew is colder.

First frost: the sun is located at longitude 2 10, and the node is 65438+1October 23-24. It's cold in the morning and evening, hot at noon, dry in autumn, obvious scene in late autumn, and more and more cold air in the south.