Does cold dew mean autumn or winter?

Cold dew is the seventeenth of the twenty-four solar terms and belongs to the fifth solar term in autumn. Cold dew is a solar term that reflects the characteristics of climate change and is a transition from cool to cold. Climate characteristics, cold dew season, autumn in the south is getting stronger and the weather is getting colder. The vast areas in the north have entered or will enter winter from late autumn.

During the cold dew season, the temperature in most parts of South China continues to drop. The average daily temperature in South China is less than 20℃. Even in the areas along the Yangtze River, it is difficult for the temperature to rise above 30℃, while the minimum temperature can drop below 10℃.

Except for a few valley lowlands, the average temperature in the northwest plateau is generally lower than 10℃. According to the standard of dividing the four seasons by climatology, it is already winter, and first frost is thousands of miles away, which is quite different from the autumn colors in the south.

Extended data:

1, agriculture:

Half a month from the cold dew to the first frost is a busy season for autumn harvest and autumn planting. In September, autumn harvest crops mature and winter crops begin to sow. It is an important period for autumn harvest, autumn planting and autumn management. Cold dew is at the heading and filling stage of late rice, so it is necessary to continue to strengthen field management, achieve shallow water irrigation, dry and wet combination, mainly wet, and avoid premature water cut-off in the later stage.

In the cold dew season, the north is in the busy season of corn harvest and winter wheat planting. Before and after the first frost, corn was harvested and winter wheat was sown.

2. Impact:

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.

Thunderstorms have disappeared in most parts of Chinese mainland, and thunder can be heard only in parts of Yunnan, Sichuan and Guizhou. The precipitation in June 5438+ 10 in North China is generally only half or less than that in September, while in Northwest China it is only a few millimeters to more than 20 millimeters. Drought and lack of rain often bring difficulties to timely sowing of winter wheat and become one of the main limiting factors for high yield of dry land wheat.

At this time, it is still autumn rain in Hainan and Southwest China, and rainy weather will also occur in Jianghuai and Jiangnan in a few years, which will have a certain impact on autumn harvest and autumn planting.

References:

Baidu encyclopedia-cold dew