Is the prediction of Zhu Kezhen temperature curve accurate?

Not particularly accurate. The climate curve of Zhu Kezhen is compiled according to the records of ancient books. The data is up to 1963, and its temperature change trend is no problem, which is very consistent with the results of modern research. However, this is only a qualitative study. The temperature change of 3 degrees Celsius is too great, and the result of modern research is only plus or minus 0.5 degrees Celsius. The frame curve is a classical model about the quantitative level of temperature change in China in recent 5,000 years. It is a curve compiled by Mr. Zhu Kezhen through studying the ancient literature of Historical Shanghai Volume.