494 • Eighth Annual Report of the 



special localities. Thus, in the hilly regions of sonthern New 

 York, the lower Hudson valley and the Adirondack highlands, 

 summer rains are moi'e frequent than ait any station given in the 

 table. Points at the eastern border of the region of Lake 

 Ontario unite the summer with the winter maximum, and the 

 station North Volney in this section has the unusual number of 

 189 rainy days during the average year, as stated by General 

 A. W. Greely in "^American Weather." 



Cloudiness. 



The average or normal values of cloudiness for the State, like 

 the estimates of rain probability, must be based mainly upon the 

 observations of the National Weather Service. A vast amount 

 of data upon the subject was collected under the Regents' system 

 of o'bservatioin, fix>m 1826 to 1863; and during the last decade of 

 the series five of the records given in the accompanying table 

 were obtained, by means of tri-daily observations. The methods 

 used prior to 1850 were radically different from those employed 

 in recent years, and hence the results of the two systems do not 

 admit of compaimson. 



The accompanying table show: (1) The average percentages 

 of cloudiness (over-cast=:100 per cent.) which obtain at eight 

 National and five Regents' stations, during each month; and (2) 

 the number of clear, pai'tly cloudy and cloudy days at the same 

 National stations, with the exceptions of Burlington, Vt. 



