166 



THE ANDES OF SOUTHERN PERU 



amount of precipitation fluctuates considerably from year to year. 

 For the earlier period, with a mean of 23.8 inches the minimum 

 (1896-7) was 8 inches and the maximum (1898-9) 36 inches. For 

 the later period, 1903-4 to 1910-11, with a mean of 29.5 inches the 

 minimum (1904-5) was 17.5 inches and the maximum (1906-7) was 

 43 inches. 



RAINFALL, SANTA LUCIA, NOV. 1913 TO OCT. 1914 





No of 



fine days 



No. of 

 rainy days 



Max. for 

 single day 



Total rainfall 

 in inches 



November 



9 

 16 

 17 



9 

 11 

 17 



8 

 27 



21 



15 



14 



17 



20 



13 



23 



3 











7 



10 



1.150 

 .700 

 .610 

 .910 

 1.102 

 0.31 

 0.35 

 0.05 

 0.00 

 0.00 

 0.05 

 0.14 



4.264 8 



December 



6.439 





3.313 



February 



2.975 



March 



4.381 



April 



0.92 



May 



1.63 





0.07 



July 



September 



31 

 31 

 23 



0.00 

 0.00 

 0.35 



October 



21 



0.56 







Total 









24.902 



WIND 



An analysis of the wind at Santa Lucia shows an excess of 

 north and south winds over those of all other directions. The 

 wind-rose for the entire period of observation (Fig. 104) clearly 

 expresses this fact. When this element is removed we observe a 

 strongly seasonal distribution of the wind. The winter is the time 

 of north and south winds. In summer the winds are chiefly from 

 the northeast or the southwest. Among single months, August 

 and February show this fact clearly as well as the less decisive 

 character of the summer (February) wind. 



The mean wind velocity for the month of February was 540 

 meters per minute for the morning and 470 meters per minute for 

 the afternoon. The higher morning rate, an unusual feature of 



8 The record is copied literally without regard to the absurdity of the second 

 and third decimal places. 



