METEOROLOGICAL OBSERVATIONS. 



125 



From the numbers we deduce the niean temperature as above of 1865 

 and its range of temperature, and then the general average for the 

 twenty-nine years, 47°.06. 



It is also seen that the mean temperature of the first half of Septem- 

 ber exceeds that of any half-month of the j'ear, and that the next to tliis 

 is that of the last half of June, 71°.80. This is its only occm^rence in 

 twenty -nine years. 



The tempei'ature was only once below zero, in 1865, viz : 2° below, on 

 February 14. 



Barometer and Eain Gauge. 







Highest 



Lowest 











General 



1865. 



Mean. 



mean. 



mean. 



Highest. 



Lowest. 



Range. 



Water. 



average. 



January 



29.40 



29.91 



28.88 



29.92 



28.92 



1.00 



2.83 



2.103 



February 



29.44 



29.91 



28.87 



29.94 



28.85 



1.09 



1.74 



2.020 



March 



29.40 



29.84 



28.62 



29.83 



28.53 



1.32 



3.17 



2.115 



April 



29.47 



29.82 



29.03 



29.95 



28.93 



1.02 



3.03 



2.461 



Jlay 



29.42 



29.77 



29.15 



29.81 



29.04 



0.77 



3.30 



2.998 



June 



29.50 



29.72 



29.20 



29.78 



29.18 



0.60 



5.43 



3.046 



July 



29.48 



29.78 



29.23 



29.82 



29.16 



0.66 



1.47 



3.261 



August 



29.53 



29.80 



29.24 



29.83 



29.18 



0.65 



1.04 



2.754 



September 



29.60 



29.84 



29.41 



29.86 



29.40 



0.46 



4.33 



3.275 



October 



29.38 



29.80 



28.65 



29.83 



28.55 



1.28 



4.29 



3.289 



November 



29.48 



30.04 



28.92 



30.12 



28.90 



1.22 



1.70 



2.769 



December 



29.47 



29.85 



29.11 



29.92 



28.92 



1.00 



1.75 



2.484 



Mean 28.46; range 1.59. Water 34.08; general average 32.525. 



As the observations on the barometer began in 1838, the mean for 

 twenty-eight years to the end of 1865, is 29.53 inches. The highest to 

 this time on the barometer is 30.47 inches, January 1, 1839, and the 

 lowest, 28.24; giving the range, 2.23 inches in the twenty-eight years. 



Mean Height oe the Barometer from the Annual. 



Year. 



Barometer. 



Year. 



Barometer. 



Year. 



Barometer. 



Year. 



Barometer. 



1838.... 



1839 .... 



1840 .... 



1841 .... 



1842 .... 



1843 .... 



1844 .... 



29.59 

 29.60 

 29.61 

 29.56 

 29.54 

 29.55 

 29.53 



1845.... 

 1846.... 

 1847.... 

 1848.... 

 1849.... 

 1850.... 

 1851.... 



29.54 

 29.54 

 29.59 

 29.63 

 29.58 

 29.44 

 29.58 



1852 



1853 



1854 



1855 



1856 



1857 



1858 



29.51 



29.56 

 29.56 

 29.51 

 29.55 

 29.53 

 29.54 



1859 . . . . 



1860 . . . . 



1861 .... 



1862 .... 



1863 .... 



1864 . . . . 



1865 .... 



29.45 

 29.46 

 29.47 

 29.47 

 29.48 

 29-39 

 29.46 



Mean of fourteen years 



29.56 



Mean of fourteen years 



29.50 



Mean of twenty-eight years, 29.53. 



