FOR THE YEAR 1866. 

 RELATIVE HUMIDITY. 



343 



1866. 



of 

 20 years. 



Extremes. 



Mean humidity of tlie year 



Month of greatest humidity 



Greatest mean monthly humidity 



Month of least humidity 



Least mean monthly humidity 



75 



January. 



83 



January. 



83 

 May. 



72 



82 in 1851. 

 Jan. 1857. 



89 

 Feb. 1843. 



73 in 1858. 

 Dec. 1858. 



81 

 April, 1849. 



76 



EXTENT OP SKY CLOUDED. 



Average 



Extremes. 



Mean cloudiness of the year 0.61 



Most cloudy month February. 



Greatest monthly mean of cloudiness 0.82 



Least cloudy month I July, Oct. 



Lowest monthly mean of cloudiness I 0.50 



WIND. 



Extremes. 



Resultant direction 



Mean resultant velocity in miles 



Mean velocity, without regard to direction ... 



Month of greatest mean velocity 



Greatest monthly mean velocity 



Month of least mean velocity 



Least monthly mean velocity , 



Day of greatest mean velocity 



Greatest daily mean velocity 



Day of least mean velocity 



Least daily mean velocity 



Hour of greatest absolute velocity i 



Greatest velocity 



