Why do some places "thunder and winter"?

Judging from the saying of "thunder for winter" circulating in these places, it is considered that it is not good to thunder in winter, which means that the winter was very cold that year, and there may even be natural disasters in the coming year, which will affect the growth of crops and lead to poor harvest. This year, a natural phenomenon of "thunder and winter" appeared in many places. As far as I know, there is hail in some places. Does this old saying make sense? How about thunder in winter?

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Thundering is a natural weather phenomenon, which is common in spring and summer and rarely heard or seen in winter. This is related to the formation conditions of thunder. As we know, lightning is a discharge phenomenon in thunderstorm clouds in the atmosphere, and its formation must meet three conditions: first, there must be enough water vapor in the air, second, there must be power to make warm and humid air rise, and third, the air must be able to produce strong convection up and down. In spring and summer, due to the influence of humid airflow in the south and strong solar radiation, the air near the ground will rise due to continuous heating, while the cold air in the upper layer will sink continuously, naturally forming strong convection up and down, and the upper layer is prone to produce thunderstorm clouds, which will lead to the natural phenomenon of lightning discharge and sometimes hail weather.

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However, in winter, mainly controlled by the cold air from Siberia, the air is cold and dry, and the radiation of the sun is weak, so it is difficult for the air to form strong convection up and down, so it is difficult to form thunderstorm clouds and thunderstorms, which is also the reason why it rarely thunders in winter. However, the weather is unpredictable. In some years, the warm and humid air flow is strong, the weather is warmer, and there is strong cold air going south in the north. When these two streams of cold and warm air meet, the lighter warm and humid air will be lifted violently, and the cold air will drop, thus forming up-and-down convection of air. At this time, it is possible to form a thunderstorm or thunderstorm weather phenomenon, which is what the folks call "thunder into winter."

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It is reasonable for the ancients to observe that the weather when it thunders in the twelfth month is generally very cold. As the saying goes, "cold is not cold, it is not a good year", but thunder in winter shows that the air humidity is high, the cold and warm air activities are very active, the weather is cold and snowy, and the natural temperature is low. This year's warm winter is a foregone conclusion, but there are also cold air coming from the north, which is why it thunders for the winter. However, this proverb is a bit out of date to predict the grain harvest in the coming year today. After all, times have changed, and farmers no longer rely entirely on the weather to grow crops.