When does the cold wave usually occur?

Cold waves usually occur in late autumn, winter and early spring.

Cold wave is a kind of disastrous weather in winter, and people are used to calling it cold wave. The so-called cold wave refers to the cold air from high latitudes, which is rapidly strengthened in a specific weather situation and invades the middle and low latitudes, causing a wide range of severe cooling, strong winds and rainy and snowy weather along the way. When this cold air reaches a certain standard, it is called a cold wave.

According to the regulations of China's meteorological department, if the temperature drop caused by cold air intrusion reaches more than 10 degrees Celsius and the lowest temperature is below 5 degrees Celsius in one day, it is called a cold wave process. Cold waves mostly occur in late autumn, winter and early spring.

Extended data:

The cold wave invading China mainly has the following paths:

1. West Road: It enters Xinjiang, China from the west of Siberia and advances to the southeast via Hexi Corridor;

2. Middle Road: After entering China from central Siberia and Mongolia, it passes through Hetao area and south-central China;

3. East Road: From East Siberia or eastern Mongolia, it enters the northeast of China and goes south through North China;

4. East Road plus West Road: The cold air in East Road goes south from the lower reaches of Hetao, and the cold air in West Road goes south from the southeast of Qinghai. Two cold air often meet on the east side of the Loess Plateau, between the Yellow River and the Yangtze River, causing a wide range of rain and snow, and then the two cold air merge south, causing strong winds and obvious cooling.

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