Why is there such a saying as "falling after autumn"?

Beginning of autumn is followed by a volt, also known as the autumn tiger. As the saying goes, beginning of autumn is still hot for 45 days. Beginning of autumn is only halfway through the hot weather, and the Mid-Autumn Festival is really cold.

The essential difference between adding a volt after autumn and the head is that it is hot all day long, especially in the hot and humid weather. Although staying in an air-conditioned room is a little better, you will feel weak after staying for a long time. I don't know what's wrong with that place. After coming out of the air-conditioned room, it will be even worse because of the large temperature difference between indoor and outdoor.

On the third and last day, it was hot during the day and cool at night. When it is hot, it is only between 9 am and 4 pm, and the rest of the time should be cool.

Relevant explanation

Autumn tiger, in meteorology, refers to the weather above 35℃ after a short period of heat recovery after lodging for three days. Occurred between the end of August and September of the Gregorian calendar every year. The reason for the formation of autumn tiger is that the western Pacific subtropical high that controls China gradually moves southward in autumn, but moves northward. Under the control of this high pressure, it is partly cloudy, sunny to sunny, with strong sunshine and rising temperature. The weather is characterized by cool in the morning and evening and high temperature exposure in the afternoon.

Due to the vast territory of China, the performance of "Autumn Tiger" is slightly different. For example, the autumn tigers in South China are later than those in the Yangtze River valley, generally delayed by 2-4 solar terms. In addition, the prevention and control time of autumn tigers is long and short every year, ranging from half a month to two months; Sometimes the autumn tiger comes and goes, and then goes back. "Autumn Tiger" weather, although the temperature is high, but generally speaking, the air is dry and sunny, it will not be very hot in the morning and evening, and it will not be too hot to breathe.

Baidu Encyclopedia-Autumn Tiger (Climate)