126 



TWENTIETH ANNUAL REPORT OF THE REGENTS 



It is also seen that the mean temperature of the first half of September 

 exceeds that of any half-month of the year, and that the next to this is that 

 of the last half of June, 71.80. This is its only occurrence in the twenty- 

 nine years. 



The temperature was only once below zero, in 1865, viz : 2° below on 

 February 14. 



2. Barometer and Rain Gauge. 



1865. 



Mean. 



Hiffhest Lowest 



Highest. 



Lowest. 



Range. 



Water. 



General 

 'average. 



January . 

 February. 



March 



April 



May 



June 



July 



August. . . . 

 September 

 October . . . 

 November 

 December 



29.40 

 29.44 

 29.40 

 29.47 

 29.42 

 29.50 

 29.48 

 29.5.3 

 29.60 

 29.38 

 29.48 

 29.47 



29.91 

 29.91 

 29.84 

 29.82 

 29.77 

 29.72 

 29.78 

 29.80 

 29.84 

 29.80 

 30.04 

 29.85 



28 88 , 

 28.87 I 

 28.62 

 29.03 1 

 29.15 I 

 29.20 I 



29.23 i 



29.24 I 

 29.41 i 

 28.65 

 28 92 

 29.11 



29.92 

 29.94 

 29.85 

 29.95 

 29.81 

 29.78 

 29.82 

 29.83 

 29.86 

 29.83 

 30.12 

 29.92 



28.92 



1.00 



2.83 



28.85 



1.09 



1.74 



28.53 



1.32 



3.17 



28.93 



1.02 



3.03 



29.04 



0.77 



3.30 



29.18 



0.60 



5.43 



29.16 



0.66 



1.47 



29.18 



0.65 



1.04 



29.40. 



0.46 



4.33 



28.55 



1.28 



4.29 



28.90 



1.22 



1.70 



28.92 



1.00 



1.75 



2.103 

 2.020 

 2.115 

 2.461 

 2.998 

 3.046 

 3.261 

 2.754 

 3.275 

 3.289 

 2.769 

 2.484 



Mean 29.46; 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, Jan. 1, 1839, and the lowest, 28.24; 

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



Mean Height of the Barometer from the annual. 



1838 ,... 29.59 



1839 29.60 



1840 29.61 



1841 29.56 



1842 29 54 



1843 29.55 



1844 29.53 



1845 29.54 



1846 29.54 



1847 29.59 



1848 29.63 



1849 29.58 



1850 29.44 



IBol 29 . 58 



788 



Mean of fourteen years 29. 56 



1852 29.51 



1853 29.56 



1854 29.66 



1855 29.51 



1856 29.55 



1857 29.53 



1858 29.54 



1859 29.45 



1860 29.46 



1861..,.. 29.47 



1862 29.47 



1863 29.48 



1864 29.39 



1865 29.46 



694 



Mean of fourteen years 20 . 50 



Mean of twenty-eight years 29.53. 



Least height of barometer, 1859, March 19th, 28.24 ; greatest height 

 of barometer, 1839, Jan. 1, 30.47 inches. The first of this gave the lowest 

 mean, 28.63, and the second the highest, 30.38, in the twenty-eight years. 

 Oct. 19th, 1865, barometer 28.55 ; but the highest that year, 30.12. 



The Rain-Gauge has given 34.08 inches of water in the year, which ex- 

 ceeds the general average, 32.525 inches, by 1.56 inch. 



The drouth, which attended the small rains of July and Au,i^ust, and 

 amounting to only 2.51 inches in two months, was closed by rain on Sep- 

 tember 5th. The grass had been injured, and pastures dried, and the early 



