What does clear autumn thirteen mean?

Refers to autumn, especially late autumn; Clear autumn also means sunny and bright autumn.

Ancient poems in autumn

The youth's tour of Chang 'an Ancient Road Horse was delayed.

Author Liu Yong, Song Dynasty

The ancient horse in Chang 'an was delayed. Gaoliu is in chaos and cicadas are hissing. Outside the sunset bird, the autumn wind and the moon are on the original, and the eyes are broken for four days.

Return to the cloud without a trace, where is the early stage. I'm not familiar with it. The drinkers are bleak, unlike last year.

autumn

Autumn is one of the four seasons. In China, traditionally, "beginning of autumn" in the 24 solar terms is taken 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.

According to the average climate temperature of modern scholar Zhang Baokun, there are four seasons in a year. The index is that the average temperature is lower than 10℃ in winter, higher than 22℃ in summer, and 10~22℃ in spring and autumn respectively.