Abstract
The categorization of winter precipitations into solid and liquid is important because the effects of snowfall and rainfall on climate, environment, and human life differ significantly. The monthly solid and liquid precipitations were calculated by reading the automatic precipitation gauge chart since the winters of 1922–1987 at the Tohkamachi Experimental Station, FFPRI. It is desired that the solid and liquid precipitations be calculated since 1988 and longtime data be obtained. Therefore, the correlation between air temperature and the ratio of snowfall during precipitation was investigated and solid and liquid precipitations were calculated. Although the precipitation particle temperature should be more similar to the wet-bulb temperature than the air temperature, there is little difference between the calculated results using these two temperatures. Accordingly, in this study, winter precipitations from 1988 to 2016 were categorized into solid and liquid precipitations using the snowfall ratio based on the air temperature.
