■*-os\ 



*-06r 



/$3S /d^S /^S 19 ^B 19^ '^^^ 



Fig. 3. — Secular changes of air tempera- 

 ture and precipitation in January at 

 Hushiki. 



the following Table I, there exists in the change of ten-year means of 

 annual ranges of air temperature marked and widespread trends such 

 as are never found in the annual mean of air temperatures (see Fig. 2). 



In order to explain the character of the above-mentioned climatic 

 trends of Japan more minutely I like to begin with the observation data 

 gained at Hushiki, a meteorological observation station along the Japan 

 Sea, Figure 3 shows the curves of secular variations of air temperature 

 and precipitations in January at Hushiki, obtained. by smoothing the 



successive five-year mean according to the formula — '^^^— — — , while 



Fig. 4 shows the curves of the secular variation of air temperatures as 

 well as precipitations in the summer season (from June to August) at 

 Hushiki, obtained by the same method as in the case of midwinter. 

 Comparing them one wiU find to one's surprise the quite similar form 

 between the curves of winter and summer, the co-ordinate of midwinter 

 temperatures and precipitations being taken positive respectively 

 downwards and upwards, vice versa in the case of summer. The summer 

 temperatures at Hushiki rise in the same process in which the midwinter 

 temperatures fall, and as for the precipitations the same thing can be 

 observed. . ' 



111 



