What is the cold weather in late spring?

Landlord, what is cold in spring as follows: cold in spring (late)

spring

Cold) refers to the weather phenomenon that the temperature rises rapidly in early spring (generally refers to March) and the temperature is lower than normal in late spring (generally refers to April or May). Long-term rainy weather or frequent cold air intrusion, or under the control of continuous cold and high pressure, strong radiation cooling in sunny nights is easy to cause late spring cold. The climate is changeable in early spring. If the cold air is strong, the temperature can drop to below 10℃, or even rain and snow, sometimes as long as 10 day and a half. In the four seasons of the year, the season with the greatest changes in meteorological elements such as temperature, airflow and air pressure is spring. It is often sunny during the day, which makes people feel "warm wind makes tourists drunk", but it is chilly in the morning and evening, which makes people feel "chilly in spring". This unpredictable "fickle" weather is what is commonly called "cold spring".