50 
BULLETIN" 1429, U. S. DEPARTMENT OF AGRICULTURE 
It is seen by reference to Figure 34 that rainfall at Yokohama was 
very light in the winter but fairly heavy in the summer months, 
whereas at Sapporo the heaviest precipitation was recorded in the 
winter, with the lowest points reached in the early summer months 
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Fig. 33.— Curves showing the mean monthly temperature and precipitation for Philadelphia, 
based on a 50-year average 
At Suigen, Chosen, however, the winter and spring precipitation is 
very low, followed by a period of exceedingly heavy rainfall during 
July and August. The rainfall during the 24 hours of July 28, 1922 
totaled 11.3 inches. A comparison of these graphs with that of 
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Fig. 34.— Curves showing the mean monthly precipitation for Sapporo and Yokohama, 
and Suigen, Chosen, based on a two-year average 
Japan, 
Philadelphia shows that Sapporo, and probably Koiwai as well, 
correspond fairly closely, whereas the heavy summer and light winter 
precipitation at Yokohama and Suigen are far removed from it. 
A consideration of the two factors of temperature and rainfall in 
the various localities reveals the fact that conditions at Koiwai and 
