DISCUSSION AND ANALYSIS OF WINDS. 



705 





June, July, August. 



December, January, February. 1 





Bi 





w 





^ , 



^ 





H 





H 



&; 





i 





65 



17 



6 



Ifi 



15 



fi 



19 11 



8 





a 



24 



11 



10 



1 



Ifi 



4 



fi 

 7 



Zone 25 N. 24 Bueuos Ayres .... 



" 24 N. 24 Assumption 



10 



14 



38 



17 



n 



?, 



fi 



?, 



















" 25 N. 23 Parana . . ■ . 



24 



21 



14 



15 



7 



12 



6 



1 



9 



18 



13 



20 



?.5 



9 



1 



5 



" 25 N. 22 Mendoza 



3 



3 



.3 



33 



13 



13 



13 



20 



9 



15 



3 



20 



30 



15 



1 



fi 



" 2G N. 28 Atlantic Ocean 50O-60O W. 



9 



29 



2 



Ifi 



Ifi 



14 



11 



2 



17 



13 



7 



13 



8 



ir. 



13 



14 



" 27 N. 19 " " 550-650 W. 



















17 



10 



4 



4 



12 



22 



14 



18 



The only observations of a year's duration made in the interior are those at 

 Mendoza and Parana by Burmeister.^ He remarks as to Mendoza, that cahns 

 largely prevail, strong winds are very rare. In Parana, on the contrary, as on the 

 coast of the La Plata States (Buenos Ayres, Montevideo) the winds are violent and 

 atmospheric changes frequent and sudden. In this respect it reminds us of the 

 climate of the Atlantic coast of the United States, though extremes of heat and cold 

 similar to those of North America are never experienced. Two winds are especially 

 noted as strong, the Pampero (S. W.) and the Su-Estada (S. E.). Though Parana 

 is near to Buenos Ayres, the yearly period of the winds is nearly opposite. (See 

 Plates 5, 6, and 7.) 



The winds on the Straits of Magellan and on the west coast of S. America are 

 very different from those of the eastern part of this continent, as shown in the 

 following table of percentages. 





June, July, August. 



December, January, February. i 





H 





w 





^ 





^ 





w 





H 





^ 





^ 





a 



a 



(B 



m 



w 



M 



31 



16 



10 



5 



4 



1 



7 



13 



41 



19 



Zone 29 N.2«JPiuita Arenas, Mag. Str. . 



19 



12 



7 







3 



12 



" 27 Puerto-Montt ) 



" 25 N. 20 Valparaiso \ Chili . 



" 25 N. 21 Santiago } 



fifi 



2 



1 



5 



8 



3 



3 



12 



29 



9 



1 



17 



28 



1 



1 



14 



35 



13 



4 



9 



17 



10 



4 



8 



18 



9 



3 



1 



30 



23 



7 



9 



7 



26 



8 



9 



11 



17 



5 



16 



4 



12 



5 



4 



8 



48 



12 



8 



" 27 Pacific Ocean, 750-800 W. . . . 



12 



4 



3 



5 



8 



17 



26 



25 



11 



6 



2 



3 



9 



17 



29 



24 



" 25 •' " 710-750 W. . . . 



22 



7 



0.4 



10 



28 



16 



5 



12 



5 



2 



0.5 



6 



62 



16 



4 



6 



" 24 " " 70O-85O W. . . . 











9 



12 



64 



8 



3 



5 















6 



69 



14 



4 



6 



" 23 " " 70O-80O W. . 



4 



1 



2 



44 



18 



24 



3 



6 















6 



70 



18 



5 



1 



" 22 " " 700-750 W. . . . 











1 



70 



18 



10 



1 















11 



78 



7 







4 







" 21 " " 76O-S0O W. . . . 











Ifi 



60 



24 



















0.8 



8 



69 



22 



U 











" 20 " " 850-950 W. . . . 







1 



7 



90 



2 



















1 



16 



75 



8 







1 







" 19 " " 80O-85O W. . . . 











2 



40 



42 



12 



2 



1 



0.5 



0.3 



3 



51 



34 



7 



2 







" 18 " " 80O-S5O W. . . . 



0.3 



3 



2 



11 



41 



37 



5 



0.5 



2 



0.9 



2 



17 



37 



30 



9 



2 



" 17 " " 750-900 W. . . . 



8 







3 



14 



15 



36 



19 



11 



16 



20 



6 



6 



3 



li 



1 



18 



The changes of the winds along the W. coast of South America are very 

 regular and gradual; we can follow them for about 60"^ of latitude. In the 

 extreme south, at Punta Arenas westerly winds are known to prevail especially from 

 December to February, the warm season, while from June to August the number 

 of N. and N. E. winds increases. These are land-winds. The mean direction is 

 found to be northwesterly at all seasons, and the ratio of resultant great (see next 

 page). We are here in the belt of westerly (or northwesterly) winds of the 



See his " Klima der Argciitini.schon Republik." 



July, 1875. 



