What is Joan Hinton?

Definition: Late spring cold refers to the weather phenomenon that the temperature rises rapidly in early spring (generally refers to March), but the temperature in late spring cold (generally refers to April or May) is lower than that in normal years.

2. Basic standards

Standard of late spring cold: 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. 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.

3. Causes of formation

Late spring cold is a common weather phenomenon, not only in China, but also in Japan, North Korea, India and the United States. The reason is not complicated. Spring in China (around March) is a transitional period of winter wind direction and summer monsoon, during which cold air from the northwest often intrudes intermittently, and the cold air goes south and sticks to the warm and humid airflow in the south, resulting in continuous low temperature and rainy weather.