When is the cold spring? When will the chill of late spring end?

Introduction: Spring is the season when everything recovers and gradually warms up, but suddenly a person who is chilly or cold in spring shudders. When is the late spring cold of 20 17? When will the chill of late spring end?

When is the cold spring?

In meteorology, the cold in late spring refers to the weather phenomenon that the temperature rises rapidly in early spring (generally refers to March), while the temperature in late spring (generally refers to April) is lower than the normal year and is often accompanied by continuous rain. In the process of warm weather in spring, due to the invasion of cold air, the temperature is obviously reduced, which is harmful to crops and has a certain impact on human health. This kind of "warm before spring and cold after spring" weather is called "cold after spring".

Late spring cold will only appear after spring. Some people think that it is a misunderstanding that the weather is not warm after beginning of spring. The "late spring cold" originated from agriculture, which mainly refers to the real spring, that is, the average temperature exceeds 10℃ in five days, and the temperature drops rapidly due to frequent attacks of strong cold air, lasting for more than 1-2 weeks, and causing large-scale freezing of crops.

The time and standard of cold spring in the north and south are different. It is early in the south and late in the north. The basic criteria for judging late spring cold are as follows: Agrometeorological experiments show that the average daily temperature is ≤ 65438 02℃ and the maintenance period is ≥3 days, which is not conducive to seedling growth. If the cooling is accompanied by rainy weather, the harm will be even greater, which is a relatively recognized indicator. According to the meteorological department of Hunan Province, the occurrence standard of late spring cold is: from mid-March to late April, the average temperature in ten days (or two consecutive seasons) is lower than the average temperature in ten days (two seasons) by more than 2℃ and lower than that in the previous ten days (or two seasons), then the ten days (or two seasons) are late spring cold. In southern China, the spring sowing time comes first and then comes, and the period and intensity index of the cold spring are also slightly different.

How long will the late spring chill last?

In early spring (generally refers to March), the temperature rises rapidly, while in late spring (generally refers to April or May), the average temperature for five days is more than 2℃ lower than normal, which is called late spring cold, so it usually takes about five days.

Why is it cold in late spring?

Late spring cold (English) refers to the phenomenon that the temperature rises rapidly in early spring (generally refers to the end of February and the beginning of March), but the temperature in late spring (generally refers to April) is lower than normal.

Specific reasons:

1, long rainy weather or frequent cold air intrusion, or strong radiation cooling in sunny nights under the control of continuous cold and high pressure are all easy to cause late spring cold.

2. The climate is changeable in early spring. If the cold air is strong, the temperature can drop to below 10℃, even in rainy and snowy weather.

At this time, it is often sunny during the day, which makes people feel that "warm wind makes tourists drunk", but it is chilly in the morning and evening, which makes people feel "chilly in spring".

4. This kind of "fickle" weather that people can't adapt to is what is usually called cold spring. It is easy to adversely affect agricultural production and residents' lives.