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 or rain rates has been obtained from the rain rate data observed for 20 years from January 1975 through December 1994. The result shows that the accumulated time distribution of one minute rain rates can be represented approximately by the composite 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 accumuiated time distributions for the period of heavy rain, the worst month and the worst wear as well as for others. we also discussed the rain rates conversion ratio for the simultaneous time ratio of the accumulated time distribution of one minute rain rates and ten minute rain rates.
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