The weather is getting worse.
Autumn is characterized by a bumper harvest, a gradual drop in temperature, a dry climate, a gradual withering of plants, a narrowing of the gap between day and night, an increase in windy weather, geese flying south, a fading summer heat, ripe rice and fog.
Rich harvest:
The orchards in autumn are fruitful and charming. Look, red apples, pears in Huang Chengcheng, persimmons with yellow in red, juicy grapes, orange pomegranates and round persimmons.
Temperature drop:
In autumn, in nature, Yin and Yang begin to change, Yang gradually recedes, Yin gradually grows, the climate turns from hot to cold, and everything comes into being with cold and gradually falls. This is the season of alternating hot and cold. As the temperature gradually drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter.
Dry climate:
After autumn, the weather turns cool, the climate is dry, and even the skin gradually peels off.
Plants wither gradually;
For perennial plants, most of them will show the phenomenon of falling leaves, which is a natural phenomenon for plants to adapt to severe winter. The leaves of plants will gradually turn yellow, curl and fall off. After autumn, the temperature will continue to drop, the respiration of plant roots will be weakened, the water supply will be affected, and normal physiological activities such as photosynthesis and transpiration will be hindered.
At this time, the leaves will enter the aging state, and it is normal for the leaves to fall. Deciduous leaves are for plants to preserve water in their bodies without threatening their growth.
The gap between day and night has narrowed;
The vernal equinox and the autumnal equinox are equally divided day and night, with the smallest gap between day and night.
Windy weather:
Not all areas will have strong winds in autumn. Although the autumn wind is a little cold, it is very refreshing, neither too cold nor too hot, and it can also make people awake.
The geese fly south:
There are many kinds of geese, most of which are large migratory birds. In autumn, they fly to the south for winter, so the winter in the north is very cold and not suitable for its survival. Besides, they can't find food, so they can live safely in the south. In spring, it will fly back to the north to breed. This is because the summer in the north is long, the food is abundant, and the enemy is less harmful, which is suitable for them to feed their young birds.
The summer heat disappeared;
The phenological standard studied by meteorologists is: after the intense summer heat, the average temperature for five days is stable below 22℃, which means that it enters autumn and ends when it is below 10℃.
Rice ripening:
The ripening time of rice is related to temperature. One-season rice in the north generally matures in September; Double-cropping rice in parts of Central China and East China, with the first-season rice maturing in early July and the second-season rice 65438+1early October; Three-season rice is planted in parts of South China and East China, with early rice maturing in the first half of July, middle rice maturing in the second half of September and late rice maturing in the first half of June.
Fog:
If the weather is fine in autumn, groundwater and soil will absorb some of the sun's heat; At night, the ground began to dissipate heat, including a lot of water vapor. Because the temperature drops greatly at night, especially before and after sunrise, reaching the lowest point of the day and condensing into fog when encountering cold water vapor.
Autumn is the third season of "spring, summer, autumn and winter" and the transitional season from summer to winter. Autumn is from September to November in the northern hemisphere and from March to May in the southern hemisphere. China traditionally takes "beginning of autumn" in the 24 solar terms as the starting point of autumn and ends with "beginning of winter". Autumn means rain, storms, etc. Tending to decline or decrease, everything in nature began to mature from lush to bleak.
Autumn alias:
Gao Qiu (autumn means crisp) is flat autumn, Bai Qiu (the five elements think that Mid-Autumn Festival equals golden white) and Bai Di (the god in charge of autumn) is golden autumn (autumn equals gold; Color of harvested plants) Sanqiu (early autumn, Mid-Autumn and late autumn) and September (ninety days in autumn equals three months).
Autumn solar terms:
Beginning of autumn:
Beginning of autumn is the thirteenth of the 24 solar terms. On August 7th or 8th every year, when the sun reaches longitude 135, it is regarded as beginning of autumn. "Autumn" means that summer turns cold, which means the beginning of autumn. But in early autumn, the weather in Jianghuai area is still very hot.
Summer:
Summer is the fourteenth of the twenty-four solar terms. "Out" means going. The summer heat is the end of the summer heat, that is, when the summer heat is over, the temperature gradually decreases and the rainfall gradually decreases.
Autumnal equinox:
The autumnal equinox is a solar term representing seasonal changes. On this autumn day, the sun is located at longitude 180 degrees, and the sunlight is almost direct to the equator, and the length of day and night is almost equal. At this time, the temperature in southern China has generally dropped below 22℃ and entered a cool autumn. "An autumn rain and a cold".
Cold dew:
After the cold dew, the cold air in the north has a certain influence, and most parts of China are controlled by cold high pressure, and the rainy season is over. The weather is often warm during the day and cool at night, with clear skies and Wan Li, which is very beneficial to the autumn harvest.
First frost:
In the first frost, the cool autumn wind blows to the flower city of Guangzhou. The average temperature in most areas of Northeast China, East Inner Mongolia and Northwest China has been below 0℃, the soil has frozen, and the winter crops have stopped growing and entered the wintering period.