What is the phenomenon of thunder and winter?

In our country, people call the phenomenon of thunder in winter "thunder in winter", or "winter thunder" for short. Thundering all year round is a normal weather phenomenon, but there are fewer thunderstorms in autumn and winter. Although the weather of "thunder in winter" is not common in autumn and winter, it is only a weather phenomenon.

Through long-term and careful observation of the phenomenon of "thunder in winter", China folk summed up the law of "thunder in winter and snow in winter", that is, thunder in winter means that the air humidity is high and it is easy to form rain and snow; There is also a folk saying that "when it thunders in winter, ten cowsheds are empty", which means that when it thunders in winter, the warm and humid airflow is very active and the cold air is also very strong. It's so cold and snowy that even cows may freeze to death.

In today's highly developed science and technology, although people's understanding of various natural phenomena is much more objective than in the past, it is undeniable that the changes of the four seasons are still full of mystery in people's eyes. Therefore, we must learn to observe and understand the abnormal phenomenon of "thunder and winter" with scientific "eyes" and understand that this is a special natural phenomenon that appears under certain conditions, which will be strange and strange; Once it appears, you won't panic and think it is an ominous sign.