The climate in Kaifeng district in the Northern Song Dynasty is the extension to the third Warm Stage following the Tang Dynasty in the history of climate vicissitudes in China. However, the changing period of the third Cold Stage, which is explained that existed in the early period of the Song Dynasty according to Zhu Kezhen, does happen in the period of Huizong Monarch. The climate, which had changed in Huizong and Qinzong periods, is changing dramatically into a new cold stage in this district. At that time, the climate alternated between Warm Stage and Cold Stage, including several alterna...