What is the sign of thunder in the twelfth lunar month?

Thunder in the twelfth lunar month shows that the cold air in the north is not strong.

In the process of driving south, it was blocked by the warm air in the south. On the contrary, the warm air is very strong, which leads to thunder. In this month1February, the temperature is so high that rape blooms ahead of time, wheat separates ahead of time, and eggs in the soil come out ahead of time because of the high temperature. This warm winter is very unfavorable to agricultural production in the coming year. Farmers will reduce production or refuse to harvest, resulting in people not having enough food, or they will be "swords and swords".