What is the saying that it rains in the first frost solar terms?

The proverb says, "The first frost rains, and the first frost rains for more than one winter." . It means that if it rains a lot before and after the arrival of the first first frost solar term, it means that it will rain all the time for the next few days, and it will rain all the way to beginning of winter. But if it doesn't rain at this time, it may not rain when we arrive in early winter.

The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day.