DISCUSSION AND ANALYSIS OF WINDS. 



691 



towards the north and east. In winter the winds are raosily N. and N. W. This 

 region is equal to more than a million square miles, or aboiot one-third of the United 

 /States, without Alaska. 



See also Maps, Plates 8, 11, and 14, which clearly show this. 



To the north and northeast is a country about which it is difficult to say any- 

 thing definite. It includes the larger part of Wisconsin and Minnesota, Northern 

 Michigan, Northern Dacotah, and Manitoba. 



The percentages of the winds in this region are: — 





Summer. 



Winter. 1 





Bi 





H 





^ 





i 





H 





M 





^ 





i 





a 



fe 



a 



ai 



ai 



m 



^ 



(5 



9 



7 



3 



w 



16 



8 



16 



9 



Si 

 31 



Eastern Dacotah . 



9 



11 



6 



25 



7 



11 



7 



25 



N. W. Minnesota . 



14 



2 



9 



4 



87 



7 



21 



G 



22 



8 



6 



5 



27 



6 



14 



17 



Central Minnesota . 



11 



9 



6 



14 



23 



9 



13 



14 



14 



9 



6 



9 



20 



8 



17 



16 



Northern Michigan 



9 



11 



3 



20 



13 



14 



14 



16 



25 



15 



3 



12 



10 



10 



12 



16 



N. Wisconsin (Lake Superior) 



7 



30 



6 



6 



10 



19 



12 



10 



13 



14 



2 



3 



5 



28 



22 



14 



S. W. Wisconsin . 



8 



6 



7 



14 



15 



18 



13 



19 



11 



6 



6 



11 



10 



14 



18 



24 



E. Wisconsin .... 



8 



13 



6 



10 



12 



22 



14 



14 



8 



9 



3 



5 



10 



29 



17 



19 



Winnipeg (Manitoba) 



16 



8 



6 



12 



24 



5 



19 



12 



24 



3 



3 



12 



20 



9 



5 



23 



In Northern Wisconsin the influence of Lake Superior is clearly seen. The 

 winds are N. E. in summer, or from the lake ; S. W. in winter, or from the land. 

 It must be remembered that the five great lakes never entirely freeze over, and that 

 the difi'erence of temperature between the air over the open water and that over 

 the land must be great. On the Canadian shore of Lake Superior (for example, 

 at Michipicoten) the winds are N. E. in winter and S. W. in summer. In Northern 

 Michigan the influence of the lake is not so clearly perceived. One of the stations, 

 Marquette, is situated on a peninsula, having the lake to the east, while others 

 have it to the north. 



Yet it seems, on the whole, as shown on Plate 8, that the winds in this belt of 

 country bear a resemblance to the monsoon region lying to the south, especially 

 the prevalence of south winds in summer, which is seen as far as Winnipeg (49° 

 52' Lat. North). 



The next region we have to consider is that between the Mississippi and the 

 Appalachian range extending southward to the Cumberland range, and northward 

 to Lakes Michigan and Huron, and somewhat beyond Lakes Erie and Ontario. 

 The percentage of the winds is as follows : — 



