What is the definition of spring in meteorology?

If the average daily temperature of five consecutive days in a year (in the northern hemisphere) is greater than or equal to 65,438+00 degrees Celsius for the first time (the average daily temperature is averaged with local temperatures of 2: 00, 8: 00, 65,438+04: 00 and 20: 00), the first day will be taken as the start date of spring.

However, spring is a season of warm and cold, sometimes cold air invades, and the temperature often drops sharply. Therefore, in some places, an item has been added: Even if there are days below 10 degrees, it cannot last for more than five consecutive days, otherwise it will not be counted as beginning of spring.

Climate in spring:

(1) The temperature changes greatly.

People generally regard spring as the beginning of a year, and everything is new and full of vitality, but spring is also the period when the weather changes the most, and the temperature changes suddenly from warm to cold. The temperature difference in a day is the largest in spring. Taking Beijing as an example, the difference between the highest temperature and the lowest temperature reached 26.8℃ on May 3rd, 1966. Therefore, in spring, we should listen to the weather forecast in time, pay attention to the weather changes and increase clothes in time.

The air is dry and windy

Spring is in the adjustment period of atmospheric circulation, and cold and warm air activities are frequent. In addition to the great temperature change, dry air and windy weather are another feature.

Spring is the transitional season between winter and summer, and the cold and warm air are equally strong, both of which are very active, so windy weather often occurs, especially in northern China, which is characterized by alternating north-south winds and strong winds.

Generally speaking, the phenomenon of frequent north-south winds can be improved after May. The arrival of a windy weather brought cold air, the temperature dropped, and at the same time reduced the air humidity. It is easy to cause colds, rhinitis, arthritis, psychosis, skin diseases and other diseases.

(3) Dust weather in the north

In spring, with the temperature rising, if there is little precipitation, the ground is dry and the wind comes, it is easy to have dusty weather. Meteorology, sandstorm weather is divided into floating dust, sand blowing and sandstorm. In northern China, March and April are the frequent periods of dusty weather.

The result of sandstorm weather is that the concentration of suspended particles in the atmosphere, especially inhalable particles harmful to human body, increases sharply, which leads to the decline of air quality.

(4) rainy weather in the south

In early spring or late autumn in China, it rained continuously for several days or even months, and the weather was cold and there was almost no sunshine. Also known as low temperature and continuous rain.

In the south, it is often rainy in spring, and low temperature and warmth appear alternately. Humidity in rainy season is high, which is easy to cause rheumatoid arthritis. In addition, it also has a great influence on people's psychological diseases. Therefore, special attention should be paid to adapting to nature and climate change in spring.