FOR THE YEAR 1871. 



cxli 



RELATIVE HUMIDITY. 



Mean humidity of the year 



Month of greatest humidity 



Greatest mean monthly humidity 



Month of least humidity 



Least mean monthly humidity ... 



1871. 



73 

 January 



81 



May 



63 



Average 



of 

 29 years. 



January 



83 



May 



71 



Extremes. 



82 in 1851 

 Jan. 1857 



Feh. 1843 



68 



73 in 1858 

 Dec. 1858 



81 

 April, 1849 



76 



EXTENT OF SKY CLOUDED. 



Mean cloudiness of the year 



Most cloudy month 



Greatest monthly mean of cloudiness . 



Least cloudy month 



Lowest monthlv mean of cloudiness ... 



Extremes. 



0.66 in '( 



o'.'ss 



0.29 



0.57 in '56 

 0.73 



o.'so 



WIND. 



Resultant direction 



Resultant velocity in miles , 



Mean velocity, -without regard to direction 



Month of greatest mean velocity , 



Greatest monthly mean velocity , 



Month of least mean velocitj' , 



Least monthly mean velocity 



Day of greatest mean velocity 



Greatest daily mean velocit}' 



Day of least mean velocity 



Least daily mean velocity 



Hour of greatest absolute velocity 



Greatest velocity 



1871. 



N720W 



2.49 



8.24 

 December 



11.52 



Sept. 



5.50 

 Nov. 15 



32.16 

 Sept. 12 



0.87 

 Dec. 20. 

 11 a.m. 

 to noon. 



45.0 



Result 



of 

 23 years. 



N 60° W 

 1.89 

 6.96 

 March 

 8.83 

 July 

 4.96 



237l2 



Extremes. 



8.55 in '60 



March, 1860 



12.41 



Aug. 1852 



3.30 



Nov. 15, '70 



32.16 



Dec. 27, '61, 

 9 to 10 a.m. 



46.0 



5.10 iu'S.". 

 Jan. 184S 



5.82 

 Sept. 1860 



5.79 

 Dec. 2, 1848 



15.30 



Mar. 14, '53 

 11 to noon. 



25.6 



