Abstract
In Mount Weather Bulletin, E Gold has shown that the diurnal variation of the amount of precipitation is negatively correlated with the diurnal variation of pressure. In his excellent book “Rain” Prof. T. Okada noticed the double oscillation in diurnal variation of precipitation in Japanese stations. The author investigated in the same problem using the records for 30 years taken at 11 stations in Japan. The result is that there are just many types of the variation of precipitation in Japan as shown in Hann's “Lehrbuch.” In Japan the amplitude of the diurnal variation decreases as the latitude increases. Of the two maxima of two double oscillations, the forenoon one is greater at the southern Japanese stations and the afternoon one is greater at the northern ones. (3) The time difference between the maximum phase of the precipitation and the minimum phase of the pressure varies between 2 to 4 hours and the difference is greater as to proceed more east in Japan.
