FOE THE YEAR 1869. 



iXXXl 



RELATIVE HUMIDITY. 



Mean hnmidity of the year 



Month of greatest humidity 



Greatest mean monthly humidity 



Month of least hnmidity 



Least mean monthly humidity .. 



November 



84 



May. 



Average 



of 

 27 years. 



January 



May. 



82 in 18.51 

 Jan. r 57. 



Feb. 1843. 

 58 



73 iu 1858 

 Dec. 1858. 



81 

 Apr. 1849. 



76 



EXTENT OF SK^ CLOUDED. 



Mean cloudiness of the year 



Most cloudy month 



Greatest monthly mean of cloudiness 



Least cloudy month 



Lowest monthly mean of cloudiness 



0-66 

 Decern. 



0-83 

 Septem. 



0.47 



Average 



of 

 16 years. 



Extremes. 



0-61 

 Novem. 



0-75 

 August. 



0-48 



0-66 in 1869 

 0-83 

 0-29 



0-57 in 1856 



o'-'vs 



0-50 



Resultant direction 



Resultant velocity in miles 



Mean velocity, v?ithout 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 -j 



Greatest velocity 



Average 



of 

 21 years. 



8-55 in 1860 

 Mar. 1860. 



12-41 

 Aug. 1852. 



3-30 



Mar. 19, '59. 



31-16 



Dec. 27, '61, 



9-10 a.m. 



46-0 



5-10 in 1853 

 Jan. 1848. 



5-82 

 Sept. 1860. 



5-79 



Dec. 2, '48. 



15-30 



Mar. 14,' 53, 



11 to noon. 



25-6 



