MARYLAND GEOLOGICAL SURVEY 



251 



ten years does not include within its limits the extremes of tempera- 

 ture to which an area having the geographic position of Cecil county 



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Fig. 12. 



(a) Highest monthly mean temperature. 



(&) Normal monthly mean temperature. 



(c) Lowest monthly mean temperature. 



Woodlawn, Cecil County. 



is subjected. It is an interesting fact, however, that the period from 

 1865 to 1875 includes a variety of conditions of heat and cold scarcely 



