Is it cold in September 2020?

As we all know, every September, the dog days end and summer is coming to an end. People begin to enter autumn, and it will get cold sooner or later. This is a period of crisp autumn. So is it cold in September 2020? Let's take a closer look!

Is it cold in September 2020? It depends on the weather conditions in different regions. Usually, it is cooler in the south in September, so it won't feel cold, while the temperature in the north will be lower, maybe a little cold.

In September, when the sun turns to longitude 165 degrees, the sunlight begins to decrease and the ultraviolet intensity begins to weaken. Affected by cold air, the night temperature drops sharply, the gap between the highest temperature and the lowest temperature gradually widens, and the temperature difference between day and night is significant.

In September, the sun stopped shining directly on the ground, and the winter monsoon came to China instead of the summer monsoon. Cold air began to wreak havoc and warm air began to fade. As the cold air goes south, the weather gets colder every day.

At the autumnal equinox, the autumn trend will be more intense, and the temperature difference between day and night will gradually increase, with the range above 10℃. After the autumnal equinox, the temperature drops day by day, getting colder day by day, and gradually entering the late autumn season (just the opposite in the southern hemisphere).

Will there be cold air in September 2020? There may be cold air.

In September, plants began to have dew entering the Bailu solar term, and the summer monsoon gradually replaced the winter wind. Cold air came and warm air gradually receded. Cold air going south in batches often brings a certain range of cooling effects. People like to use the expression "white dew in autumn night, cold night after night" to describe the situation of rapid temperature drop.

At this time, the precipitation in northern China dropped significantly, and the weather in autumn was cool and relatively dry. In the middle and lower reaches of the Yangtze River, the first autumn rain can often alleviate the water shortage in the early stage, but if the cold air meets a typhoon, or the cold and warm air are evenly matched, the two sides will fight each other, and heavy rainfall or low-temperature continuous rainfall is not conducive to the growth of autumn crops.

At the autumnal equinox, 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 the south generally drops below 22℃, entering a cool autumn. An autumn rain and a cold. The cold air from the south meets the warm and humid air that gradually drops, which produces rainfall and the temperature drops again and again.

The weather in September is characterized by 1, and the temperature drops faster and drier.

After the autumn storm brought by strong cold air, the temperature drops greatly, generally 8℃ and 10℃. However, most stormy weather does not last long (except in western China). Controlled by cold and high pressure, it is warm during the day and cool at night, and autumn is often refreshing. The weather has also become drier.

2. The average temperature distribution changes greatly.

From September to 10, the regional difference of average temperature distribution in China is obvious. In southern China, the average temperature in most areas is higher than 22℃, while in Hainan, the average temperature is higher than 25℃, and summer is not over yet. The temperature in Jianghuai and Jiangnan is generally between 15℃ and 20℃, and the temperature in southeast, north China and Huanghuai is between-16℃. At this time, the average temperature in northwest, central and northeast China has reached below 8. The average temperature in some plateau areas of Qinghai Province is even lower than 0℃.