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This dataset are historical ground temperature, frost depth and relevant meteorological measurements in Japan. The origin (individuals or institutions) of a datum is acknowledged either by the directory name in which data file(s) for the datum resides, or in the “source” column of the datum. Those portions of the data, originated and provided from Japan Meteorological Agency (JMA) and digitalized by JAMSTEC and JMA, shall belong to JMA and JAMSTEC.