Reconstruction of climate variation in winter from 14th to 16th centuries

Abstract

  Here, I mainly use the daily weather extracted from document record. The snow ratio is decided as the index of a climate change. It uses only the record around Kyoto, and only in December, January, and February. Change with the cycle of about 40 years is seen by this snow ratio, and it is presumed that change of temperature was large. By observation record in present Kyoto the relation of snow ratio and temperature is analyzed. The winter average temperature of Kyoto of the 14-16th century is 0.4-0.6 degree low, compared with present, but since it is a warming, examination is required.