Mt.Tokachidake (Mt.Tokachi) 30
Temperature: minus 18 degrees Celsius at the Tokachidake Hot Springs (Tokachidake Onsen) and minus 26 degrees Celsius in the KTV (katabatic valley).
There was no radiative cooling and no inversion layer. However, supper-cold katabatic winds were descending in the katabatic valley. The voltage of battery of the camera went down soon and he had to change the battery. He heard the sound of frost crack four times. After the interval training at the summit, he descended. He passed two cars on the descent.
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