CLIMATOLOGY OF THE PERUVIAN ANDES 



135 



5,635 feet, 2 and near the eastern border of the pampa, exhibits a 

 tendency toward the climatic characteristics of the adjacent zone. 

 Data for a camp station out on the pampa a few leagues from 

 the town, were collected by Mr. J. P. Little of the staff of the 



8 a.m. 



2 p.m 



8 p.m 



Fig. 87 — Wind roses for La Joya for the period April, 1892, to December, 1895. 

 Compare the strong afternoon indraught from the south with the same phenomenon 

 at Mollendo, Fig. 79. Figures drawn from data in Peruvian Meteorology, 1892-1895, 

 Annals of the Astronomical Observatory of Harvard College, Vol. 39, Pt. 2, Cambridge, 

 Mass., 1906. 



Peruvian Expedition of 1912-13. They relate to the period 

 January to March, 1913. Wind roses for these months show the 

 characteristic light northwesterly winds of the early morning 

 hours, in sharp contrast with the strong south and southwesterly 

 indraught of the afternoon. The daily march of cloudiness is 

 closely coordinated. Quotations from Mr. Little's field notes fol- 

 low: 



"In the morning there is seldom any noticeable wind. A 

 breeze starts at 10 a. m., generally about 180° (i. e. due south), 

 increases to 2 or 3 velocity at noon, having veered some 25° to the 

 southwest. It reaches a maximum velocity of 3 to 4 at about 4.00 

 p. m., now coming about 225° (i. e. southwest). By 6 p. m. the wind 



2 This is the elevation obtained by the Peruvian Expedition. Eaimondi's figure 

 (1,832 m.) is higher. 



