Seven laws of sad autumn

The seven laws of sad autumn are as follows:

Since ancient times, poets have written more about autumn and left their sorrows. Spring flowers and old cicadas are silent, leaves and new frost geese crow. Strangely, the dead stems cover the stone road, and the willows fall on the lake. No one asked the lonely and desolate path, why not add a period of sorrow.

Specific introduction in autumn:

Autumn is one of the four seasons. Traditionally, China takes "beginning of autumn" in the 24 solar terms as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease, and everything in nature begins to mature from lush.

At present, the four seasons are usually divided according to the average temperature of modern scholar Zhang Baokun. The index is that the average temperature is below 10℃ in winter, above 22℃ in summer, and 10~22℃ in spring or autumn. Autumn is a season of alternating hot and cold. Early autumn is still in the heat, but it hasn't come out yet. This is the hottest, wettest and sultry period of the year.

After late autumn, it is sunny during the day, cool and dry at night, with large temperature difference between morning and evening, less rain and insufficient water. Therefore, autumn dryness has become the main feature of late autumn. Traditionally, China takes "beginning of autumn" in 24 solar terms as the starting point of autumn. The word "autumn" consists of the word "grain" and the word "fire", indicating the maturity of the five grains.

Introduction to autumn climate:

After entering autumn, in nature, everything begins to mature from lush. Its climate began to change from rainy and humid in summer to dry and rainy in autumn. The four seasons in China are often divided according to the change of temperature, using the "average temperature" of modern scholar Zhang Baokun.

According to the weather average temperature method, there are two main criteria to judge autumn. First, the average daily temperature for five consecutive days 10℃-22℃ can be regarded as autumn and become a "short mark"; Second, the moving average temperature of five consecutive groups is lower than 22℃. A set of moving average temperatures refers to the average temperature of the day plus the average temperature of the previous four days divided by 5 to get the moving average temperature of five days, which is a "sliding scale". Autumn divided by temperature means cool weather.