1909.] 



THE CAYUGA LAKE BASIN, N. Y. 



381 



Romulus, 



May is-Oct. 15 



May 2-Oct. 25 

 April 22-Sept'. 22 



May 3-Oct. 26 



May 2i-0ct. 8 



May 2i-0ct. 9 



Auburn.* 



May 14-Oct. 10 



May 2-Oct. 24 

 April 22-Sept. 22 



May 2-Oct. 23 



May 2i-Oct. 8 



May 2i-0ct. 9 



The average precipitation for the Central Lake region is slightly 

 less than that for either the Great Lake or Eastern Plateau. The 

 mean annual precipitation for these regions compiled from precipi- 

 tation data for the years 1891 to 1902 is : Great Lakes 35.65 inches, 

 Eastern Plateau 40.8 inches, Central Lakes 34.46 inches. The nor- 

 mal monthly precipitation at Ithaca compiled from the last twenty- 

 nine years follows: 



January 2.16 in. 



February 1.87 in. 



March 2.44 in. 



April 2.29 in. 



May 3.43 in. 



June 3.88 in. 



July 3-7S in- 

 August 3.24 in. 



September 2.83 in. 



October 3.17 in. 



November 2.58 in. 



December 2.64 in. 



From 1900 to 1907 there have been from 150 to 185 rainy days 

 each year. For the same period the annual snowfall (unmelted) 

 has varied from 46.4 to 75.8 inches, the average being 63.6. One of 

 the striking features of the region about Ithaca is the small per- 

 centage of clear days, as the following table will show : 



1900 

 1901 

 1902 

 1903 

 1904 

 190S 

 1906 

 1907 



Cloudy. 



,. 174 



.. 171 



,. 149 



.. 195 



, . 180 



. . 148 



, . 164 



. . 163 



Partly Cloudy. 

 109 

 126 



ISI 



98 



IIS 

 126 



92 



140 



Clear. 

 82 



68 



65 

 72 



71 



91 



109 



62 



Percentage of 

 Clear Days. 



22.4 



18.6 



17.8 



19.7 



19.4 



24.9 



29.8 



16.9 



Based upon average hours of sunshine from 1900 to 1903 R. G. 

 Allen derived 49 per cent, as an annual mean of sunshine, or a 

 monthly mean of 189 hours of sunshine. 



The average of mean relative humidities at Ithaca from 1900 to 



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