In the south, what is the climate phenomenon of snow after the vernal equinox?

Late spring cold refers to a weather phenomenon in which 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.

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.

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 commonly known as "cold spring". According to historical data, the probability of "late spring cold" in Beijing within 30 years is about 57%.

Especially in early spring, this climate feature is particularly obvious. For example, on March 8, the highest temperature in the southern suburbs observatory has reached 15.2℃, while the lowest temperature is only 3.3℃, and the temperature difference between morning and evening is still relatively large.