The old man often says, "The morning is cold in early autumn, and the evening is hot in early autumn." What is the truth?

According to folklore experts, "beginning of autumn" is an important festival of China New Year. As early as 3,000 years ago, the ancients had the ceremony of "the western suburbs welcome autumn on the day of beginning of autumn", and there were many customs. Today, there are still some folk customs in China, such as "sticking on autumn fat" and "biting autumn" in beginning of autumn. According to folklore experts, the ancients regarded "beginning of autumn" as an important moment at the turn of summer and autumn and always attached great importance to it. In ancient China, there were many customs of welcoming autumn in early autumn.

This old agricultural proverb is about the relationship between beginning of autumn and the hot and cold weather in the morning and evening. It predicts whether it will be cold or hot after beginning of autumn according to the morning and evening of early autumn. The definitions of "beginning of autumn early" and "beginning of autumn late" are judged according to the time point in beginning of autumn. The saying handed down from my hometown is that beginning of autumn is called "early autumn" from 0: 00 noon to 12; Beginning of autumn after noon 12 and before 24: 00 pm is called "late beginning of autumn".

To know whether it is cold or hot after beginning of autumn depends on the specific time in beginning of autumn, whether it is before or after noon on 12. If this year belongs to "early autumn", then the weather will cool down faster after beginning of autumn, and there will be a cool breeze blowing; And if this year belongs to the "late beginning of autumn", then the weather is still hot after beginning of autumn, and autumn tigers will be extremely rampant.

"The mornings in beginning of autumn are cold, while the nights in beginning of autumn are hot and lifeless." Folk believe that if beginning of autumn time is in the morning, the weather will be cool; If beginning of autumn time is after afternoon, it will be hot for some time. The meteorological department said that the factors affecting the weather are very complicated, and the current meteorological monitoring is still uncertain. However, if the subtropical high controls the southern region for a long time in the process of going south, there will be an "autumn tiger".