.Jefferson County 



371 



The following table, compiled from observations covering the 

 period 1890 to 1917, shows both normal and extreme tempera- 

 tures and precipitation: 



Record of Temperature and Precipitation at Watertown 



January . . 

 February. . 



March 



April 



May 



June 



July 



August 

 September . 

 October . . . 

 November . 

 December . 



Year 



Tempekatuke 



Aver- 

 age 



20.9 

 19.1 

 30 1 

 44.2 

 56.5 

 65.3 

 69.9 

 68.1 

 61.4 

 50 1 

 36.9 

 24.6 



45.6 



Highest 

 maximum 



Degrees Year 



66 

 63 

 76 

 86 

 92 

 98 

 99 

 97 

 94 

 86 

 78 

 65 



99 



1906 



1906 



1905 



1899 



1911 



1895* 



1894 



1916 



1895 



1898 



1896 



1901 



1894 



Lowest 

 minimum 



Degrees Year 



—30 



—28 



—14 



4 



21 



33 



35 



37 



26 



18 



—2 



—24 



—30 



1904 



1914* 



1916 



1898 



1902 



1910 



1898 



1915* 



1896 



1903* 



1900 



1914 



1904 



Precipitation 



Average 

 inches 



1.78 

 2.39 

 2.70 

 2.31 

 3.56 



3.13 

 33.01 



Amount in 24 

 hours 



Greatest 



record, 



inches 



1 90 

 2.23 

 1.75 



1.22 

 3.22 

 2.87 

 2.65 

 4.28 

 2.90 

 2.28 

 2.99 

 2.29 



4.28 



Year 



1894 

 1908 

 1900 

 1899 

 1906 

 1905 

 1891 

 1893 

 1906 

 1906 

 1900 

 1901 



1893 



Snow, 

 average 



depth 

 in inches 



22.4 



22.6 



14.3 



3.2 



0.1 



T. 



0.5 



11.1 



25.4 



99.6 



Also earlier vears. 



TOPOGRAPHY AND NATURAL CHARACTERISTICS 



The southwestern part is low and marshy, but at a short 

 distance from the lake the land rises in gentle undulations 

 and farther inland by abrupt terraces to the most elevated part, 

 1,750 feet high, in the town of Worth. A plateau about 1,000 

 feet above the lake spreads out from the summits and extends 

 into Oswego and Lewis counties. North of Black River, the 

 largest stream of this section, the surface is generally flat or 

 slightly undulating; in the extreme northeastern corner it is 

 broken by low ridges parallel to the St. Lawrence. Small streams 

 flowing into Lake Ontario and the St. Lawrence River drain a 

 large part of the county. 



Black River Bay is considered the finest harbor in Lake On- 

 tario and is surpassed by none on the upper lakes for capacity, 

 depth of water, and safety. Many islands in Lake Ontario and 

 the St. Lawrence River, including the Thousand Islands, form 

 part of this county. 



