Based on the content of the text, what is the late spring cold in the season? (The article is "The late spring cold is a hurdle in the season") As soon as possible, thank you! ~

Late spring coldness (English late spring coldness) means that the temperature rises quickly in early spring (generally refers to late February and early March), and in late spring (generally refers to April) the temperature is cooler than normal years. Low weather phenomena. Long-term rainy weather or frequent cold air invasion, or strong radiation cooling on clear nights under the control of continuous cold and high pressure can easily cause late spring cold. The weather in early spring is changeable. If the cold air is strong, the temperature can drop sharply below 10°C, or even rain or snow. At this time, the sun is often warm during the day, which makes people feel like "the warm wind makes tourists drunk". However, in the morning and evening, it is cold, making people feel "spring cold". This kind of "fickle" weather that is difficult for people to adapt to is commonly known as late spring cold. It can easily have adverse effects on agricultural production and residents' lives.