Abstract
The cool summer damage in the rice crops frequently occurs in northeastern Japan, because the cool summer often appears in this district. Fig. 1 shows the distribution of number of years in which the mean air temperature of July records minus deviation value above -2°C from annual averages in the period of 1900-1959, Fig. 2 shows the distribution of that above -2.5°C, and Fig. 3 shows the distribution of that above -3°C. From these maps, the central areas in the cool summer area are known.
