Academy of Science. 



91 



79.36; the driest month was April, with mean humiditj', 64.90 There were eleven 

 fogs during the year. The lowest humidity for any single observation was 22.5, on 

 April 5th. 



The following tables give the mean temperature, the extremes of temperature, the 

 velocity of the wind, the percentage of cloudiness, the relative humiditj', and the 

 rainfall for each month of the year 1877, and a comparison with preceding years: 



COMP.\RISON WITH PREVIOUS YEARS. 



Years . 



1877 

 1876 

 1875 

 1874 

 1873 

 1872 

 1871 

 1870 

 1869 

 1868 



S«5 



54°. 16 

 52.76 

 50.60 

 54.20 

 52.71 

 51.90 

 54.30 

 54.50 

 50.99 

 53.36 



3 S 



S M 



g s 3 



99.0 

 98.0 

 99.0 

 108.0 

 104.0 

 97.0 

 103.0 

 102.0 

 96.0 

 101.0 



—9.0 



-5.0 

 —16.5 



—3.0 

 —26.0 

 —18.0 



—6.0 

 —10.0 



-5.0 

 —16.5 



113,967 

 148,120 

 145,316 

 145,865 

 154,508 



47.12 

 41.27 

 44.81 

 45.54 

 42.46 

 44.33 

 47.37 

 47.88 

 49.23 

 42.35 



< a 



72.6 

 66.8 

 65.5 

 65.5 

 64.0 

 64.4 



?.4 





41.09 

 44.18 

 28.87 

 28. 8T 

 32.94 

 32.63 

 33.23 

 31.38 

 38.51 

 37.42 



In presenting the above report, I desire to acknowledge my indebtedness to Prof. 

 F. O. Marvin for taking the observations during my six weeks' absence in the sum- 

 mer vacation. 



F. H. S. 



