The old ancients thought it was a bad omen. The ancients did not have a correct understanding of thunder and lightning, and thought that thunder in the first month was not a good omen. However, from a scientific point of view, there is nothing wrong with thunder in the first month, but a very normal natural phenomenon.

It snowed and thundered in the first month, and the old ancients said that there were "thunder grave valley in the first month", "thunder earth valley in the first month" and "thunder dung valley in February" and so on. Generally speaking, it is best for spring thunder to appear before and after the shock.

The ancient poem "Shang Xie" wrote: "In winter, Lei Zhen is rainy and snowy, and in summer, heaven and earth are in harmony, but dare to break with you!" It thunders in winter and snows in summer. The answer is for reference only. Please don't be blind and superstitious.