The pre-Zhou period before the establishment of the Western Zhou Dynasty, that is, the Xia and Shang slave dynasties, lasted from the 6th century BC to the 6th century BC. The climate of this period, according to the analysis data of Fufeng county chopping board site, should be as warm and semi-humid as Longshan culture period. The inscription of "Inauguration Spell" was found in Oracle Bone Inscriptions of Joo Won?. It refers to rhinoceros in ancient times, which is mutually confirmed with the record of "being redeemed" in Oracle Bone Inscriptions of Yin Ruins. It also proves that the climate in Guanzhong area in the early Zhou Dynasty was as warm and humid as the southern foot of Taihang Mountain. During the Qin Dynasty and the early years of the Western Han Dynasty, the climate in Guanzhong area remained warm and humid after the Spring and Autumn Period and the Warring States Period. The "Thousand Mu Bamboo in Weichuan" mentioned in Biography of Historical Records of Huo Zhi and the "Guangdong, Guangxi, Duzhulin and Nanshan Tantuo" mentioned in Geography of Hanshu are evidence that the climate at that time was warmer than today. Some scholars have come to the conclusion that the climate in Guanzhong of Qin Dynasty is warm, humid and rainy by studying the phenomenon of a large amount of silt in the No.1 pit of Qin Terracotta Warriors, the waterproof dam specially built in the cemetery, the perfect drainage system and the high-quality drainage pipeline.
According to this, it can be judged that the climate of Qin Dynasty was as warm and humid as that of the Spring and Autumn Period and the Warring States Period in the early Western Han Dynasty, with higher annual average temperature and more annual average precipitation. In the late Western Han Dynasty, that is, after Liang Wudi, the climate in Guanzhong began to cool again. According to the records of five elements in Hanshu, before the first year of Emperor Yuanshou of the Han Dynasty, there were only records of "heavy rain and snow" in June of the fourth year BC of Emperor Han and March of the sixth year BC of Emperor Han Jing. Since the first year of Emperor Yuanshou of the Han Dynasty, it was built in March of the second year of Ding Yuan BC, April of the third year of Ding Yuan BC and Yuan Di. Before and after, the climate in the later period is obviously colder than that in the earlier period. According to the agricultural records of Si Shengzhi, Emperor Wu of the Han Dynasty, in the late Western Han Dynasty, after the summer solstice, Guanzhong was the most suitable place to grow wheat. "If you plant early, the ear will be strong. If you plant late, the ear will be small and not strong." The day after summer, the solstice is still in front of the Millennium. Wheat planting in Guanzhong is generally after the autumnal equinox, about days later than in the late Western Han Dynasty. This also shows that the climate at that time was colder than today. In the twentieth year of Emperor Wendi, a snowstorm was recorded in Beijing in November. This is obviously warmer than the cold climate in Cao Wei, Western Jin, Sixteen Kingdoms and Northern Dynasties. However, there were still many droughts in Guanzhong during this period, such as "drought in seven states of Guanzhong" in August of Kai's sixth year, "drought in all states of Guanzhong" in May of Kai's fourteenth year and "drought in Guanzhong" in August. It shows that Guanzhong is still relatively dry. After the Sui Dynasty, the Tang Dynasty lasted for one year, which was another powerful dynasty in China history after the Western Han Dynasty. Because Guanzhong is the location of Wang porcelain, the historical record of climate in this area is more detailed. According to the records in Ji and Wu Xing Zhi in Old Tang Shu and New Tang Shu, the years when there was no ice and snow in Guanzhong area in Tang Dynasty were twenty-three years of Zhenguan, two years of Yonghui, two years of Linde, two years of Yifeng, two years of Wu Zetian, three years of Kaiyuan in Tang Xuanzong, nine years of Kaiyuan, seventeen years of Kaiyuan, one year of Tianbao and two years of Tianbao. This is unique in the history of China. This shows that the climate in the Tang Dynasty was really warm. In combination with the fact that plum trees still grew inside and outside Chang 'an City in the Tang Dynasty, oranges were planted in the palace and could bear fruit. At that time, the temperature was higher than now.
The warmer climate in the Tang Dynasty can also be confirmed by archaeological data. From the excavation of various figurines and tomb murals in the Tang Dynasty, it can be found that all men, women and children were wearing thin clothes at that time, especially ladies, with bare chests and bare backs, whispering softly. In the later Song, Yuan and Ming Dynasties, the figurines were mainly made of cotton robes and thick clothes. At the same time, the emperors and nobles of the Tang Dynasty often went to Jiucheng Palace, Yuhua Palace, Cuiwei Palace and Huaqing Palace in the mountainous areas for summer vacation, and officials in Beijing also allowed one day off every summer without going to court. These living customs also reflected the climate in Guanzhong at that time. Of course, there are also some records of heavy snow and cold in winter in Guanzhong area in the history books of Tang Dynasty. However, if we compare the records of no snow in winter with heavy rain and heavy snow in winter, we can see that in the early and middle period of Tang Dynasty, that is, a century before Zhenyuan period in Tang Dezong, the climate was mainly warm winter with high temperature. In the late Tang Dynasty, that is, a century after Zhenyuan, it was mainly cold winter, and frost and snow also hurt crops in spring and autumn. This shows that in the late Tang dynasty, the climate turned cold again and lasted for five dynasties and one year. Generally speaking, the Sui, pre-Tang and mid-Tang dynasties had a warm and humid climate close to the subtropical zone, with the annual average temperature higher than that of modern℃ and the annual average precipitation slightly higher than that of the late Tang and Five Dynasties, and the climate turned cool and dry.