In what season do cold waves mainly occur?

A cold wave refers to the cold air from the polar regions or high latitudes passing through a certain path and invading mid- and low-latitudes from the north or northwest, triggering intense cold weather. Cold waves usually occur in winter or early spring.

In China, the main cold wave outbreak period is from January to February of the following year, with December to January being the most active season. During this period, due to the obvious fluctuations in the north-south airflow intersection zone, cold air activities were frequent, and the cold air continued to invade southward, leading to the outbreak of cold waves.

The impact of cold wave

1. Harmful to people’s health. The severe cold weather brought by the cold wave may cause people to suffer from colds, respiratory diseases and other diseases, and in severe cases may be life-threatening.

2. Impact on transportation. The strong winds, rain and snow brought by the cold wave will affect highways, railways, aviation and other transportation, leading to road closures, stranded vehicles and other problems.

3. Threaten agricultural production. The cold wave may damage farmland, rice fields and other crops, leading to crop yield reduction, death and other problems, thus posing a threat to agricultural production.

4. Impact on urban water supply, power supply and other infrastructure. The cold wave may cause problems such as freezing of water supply pipelines and power supply facilities, and power outages, posing threats to the city's water supply and power supply.

5. Threaten wild animals and plants. Cold waves may cause the death of wild animals, regulate plant metabolism and other problems, posing threats to the ecological environment.