Together with the millimeter wave propagation experiment, the measurement of one minute rain rates has been continued in Nagoya since December 1974. In this paper, the accumulated time distribution of rain rates has been obtained from the rain rate data observed for 18 years from January 1975 through December 1992. The result shows that the accumulated time distribution of one minute rain rates can be represented approximately by the logarithmic normal distribution. Moreover, the study includes the characteristics of annual changes of the accumulated time distribution, the accumulated time distributions between two observation points, the accumulated time distributions for the worst month as well as for the worst year and others.
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