Climate characteristics of the white dew season

1. The footsteps of autumn come to the Yangtze River Basin

Autumn is the best season of the year, with bright and warm sunshine. The sky is as blue as the sea, the clouds are white and quiet, the breeze is refreshing, and the soft wind brings the fragrance of flowers and fruits in the garden...

During the white dew period, the cold air brought by high pressure in Mongolia, It has a certain strength, but generally speaking it is not very powerful. It mainly affects northern my country and the middle and lower reaches of the Yangtze River. In rare cases, strong cold air can move south to northern southern China. In the north, under its control, precipitation decreases, the clouds are light and the wind is light, and the temperature is neither cold nor hot. It is the golden season of the year for autumn travel.

2. The daily temperature difference increases, so be careful to prevent colds

As the sunshine weakens and the cold air cools down, especially after an autumn rain, the minimum temperature drops significantly. The temperature difference between the daily maximum and minimum temperatures in various parts of my country is gradually increasing, which is what is commonly referred to as an increase in the daily range in meteorology.

According to data records: the average diurnal range in East China is 5 to 9°C, in central and southern China is 7 to 12°C, and in North China is 10 to 15°C. The diurnal range in the northwest and northeast is even greater. It can even reach 18~20℃. Therefore, the temperature difference between day and night before and after the white dew is the second largest period after spring. There is a proverb describing: "The night of the autumnal equinox is white with dew, and the night is cool." The temperature drop in the early morning at night is often the cause of people catching cold and getting sick.

3. Pay attention to serious autumn droughts and be alert to fires

If the latent drought in the middle and lower reaches of the Yangtze River, the summer drought in West China, and South China are not nourished by the autumn rain, they may form summer and autumn droughts. Continuous drought. There is a proverb to describe it: "Spring drought is not considered a drought, and autumn drought is reduced by half. Spring drought builds warehouses, but autumn drought stops growing grain."

Some areas in the north, such as Shaanxi, Shanxi, Gansu, North China, etc. in the northwest In the land, autumn precipitation is already low. If a severe autumn drought occurs, it will not only affect the autumn crop harvest, but also delay the sowing and emergence growth of autumn crops, affecting the next year's harvest.

In addition, with the autumn drought, especially in mountainous forest areas, the air is dry and the wind is increasing, and the forest fire risk has begun to enter the period of high incidence in autumn.