168 



Agricultural Manual 



Average dates for the last killing frost in spring and the first 

 in fall are May 8 and October 10, giving a growing season of 155 

 days. 



The following table, compiled from records covering the period 

 1800 to 1015, shows both normal and extreme temperatures and 

 precipitation: 



Record of Temperature and Precipitation at Volusia 



January. . . . 

 February . . . 



March 



April 



May 



June 



July 



August 



September. . 

 October. . . . 

 November. . 

 December . . . 



Year 





Tbmpebaturb 







Precipitation 





Highest 



Lowest 





Amount in 24 



Aver- 

 age 



maximum 



minimum 





hours 











inches 



Cre.it est 







Decrees 



Year 



Dcprecs 



Year 





record, 

 inches 



Year 



23.4 



68 



1906 



—13 



1904 



3.19 



1.47 



1900 



19 



64 



1906 



—18 



1912 



2.46 



93 



1909 



32.1 



SO 



1910 



—0 



1901 



2 73 



2.45 



1913 



42.8 



80 



1913* 



8 



1909 



2.86 



2.53 



1901 



56.0 



91 



1911 



26 



1911* 



3.38 



2 10 



1914 



63.7 



92 



1910 



36 



1913* 



3.12 



1.64 



1905 



68.6 



98 



1911 



43 



1904 



3 44 



2.09 



1900 



66.6 



92 



1914 



41 



1910 



3.24 



2.35 



1905 



61.4 



91 



1900 



30 



1904 



3.73 



3.36 



1901 



50.6 



85 



1900 



23 



1911* 



3 .91 



2.37 



1912 



37.7 



74 



1909 



7 



1905 



3 51 



1.61 



1900 



26.8 



62 



1914 



— t 



1914 



2.93 



1.20 



1900 



45.7 



98 



1911 



— 18 



1912 



38.50 



3.36 



1901 



Snow, 

 average 

 depth 



in inches 



20.3 



14.9 



9.5 



5.5 



1.7 



T. 

 2.3 



13 4 

 19.8 



87.4 



* Also earlier years. 



TOPOGRAPHY AND NATURAL CHARACTERISTICS 

 The surface is mostly a hilly and rolling upland. A bluff with 

 an average elevation of twenty feet extends along the lake. From 

 the summit the land spreads out into an undulating region 

 gradually rising throughout a distance of three or four miles. 

 This comparatively level tract is bordered by the slopes of a hilly 

 upland which occupies the center and southern parts of the county. 

 The highest summits rise 1,200 to 1,400 feet above Lake Eric, and 

 1,800 to 2,000 feet above tide. The uplands are broken by 

 several deep valleys, the principal of which are those of Chau- 

 tauqua Lake and i Jonewango Creek. The summits of the hills four 

 to six miles - roth of the lake shore form the watershed that divides 

 the waters of Lake Erie from those of the Allegheny River. 



The streams of the county are principally tributaries of Lake 

 Erie and Allegheny River. Chautauqua Lake is a; beautiful sheet 



