METEOR OL GIGA L OBSER VA TIONS. 



133 



5. ANNUAL MEAN TEMPERATURE OF THE THIRTY YEARS. 



Year. 



Tempera- 



Year. 



Tempera- 



Year. 



Tempera- Year. 



Tempera- 





ture. 





ture. 





ture. 



ture. 



1837.... 



45.72 



1844.... 



46.71 



1851 



47.75 



1859.... 



47.32 



1838.... 



45.10 



1845.... 



47.01 



1852 



47.09 



I860.... 



47.58 



1839 .... 



46.72 



1846.... 



48.26 



1853 



48.30 



1861.,.. 



47.31 



1840 .... 



47.06 



1847.... 



46.44 



1854 



47.97 



1862.... 



47.38 



1841 .... 



46.36 



1848.... 



47.94 



1855 



46.76 



1863.... 



47.30 



1842 .... 



47.44 



1849.... 



47.59 



1856 



44.97 



1864.... 



47.73 



1843.... 



44.70 



1850.... 



47.95 



1857 



1858 



45.94 

 47.64 



1865.... 

 1866.... 



48.16 

 46.38 









655.02 

















755.33 



Mean temperature for 14 years . . 



46.79 













Mean temperature for 16 years. . 



47.21 



The following exhibits the mean of thirty years as derived (1) from 

 the sum of means for the first fourteen and last sixteen years, and 

 (2) jfrom the means of these periods respectively : 



Number of Years. 



Sum of 

 means. 



Number of Years. 



Mean. 



First fourteen years 



655.02 

 755.33 



First fourteen vears .... 



46.79 

 47.21 



Last sixteen years 



Last sixteen years .... 





Mean of thirty years 



Mean of thirty years 



1,410.35 



94.00 



47.01 



47.00 



Range of annual temperature is from 44°.70 in 1843, to 48°.30 in 

 1853, amoimting to 3°.60. 



Average temperature of the four seasons follows : 



SEASON. 



Sum of 



three 

 mouths. 



Monthly- 

 average. 



Spring 



132.8 



205.3 



146.8 



79.5 



44.3 

 68.4 

 48.9 

 26.5 



Summer 





Winter 





