No. 189.] 



39 



Meteorological Observations at Rochester, for 18G3. By C. Dewey. 



Observations at 7 A. m., 2 p. m., and 3 p. m. Monthly results. 



1. Thermometer. 



1863. 

 January . 

 February 

 March . 

 April . . 

 May... 

 June . . 

 July... 

 August 

 September 

 October . . 

 November 

 December 



Mean. 



1st half, 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



1st 



do 



2d 



do 



33.33« 



28.35 



23.36 



28.88 



25.02 



31.35 



37.95 



48.47 



50.85 



04.62 



62.69 



66.47 



74.22 



68.96 



74.98 



64.65 



61.51 



54.42 



50.89 



46.29 



42.75 



37.87 



32.31 



25.40 



I 26.12 j 



30.76° 

 26.12 



28.29 

 43.21 

 67.96 

 64.58 

 71.51 

 69.67 

 57.96 

 48.52 

 40.31 

 28.74 



I 69.67 j 



Highest 

 mean. 



47.67° 



38.67 



35.00 



43.00 



36 . 33 



43.00 



63.00 



55.00 



67.00 



72.00 



73.33 



78.00 



79.33 



76.00 



80 . ,33 



75.33 



71.67 



76.00 



62.67 



65.33 



56.33 



49.67 



46.00 



37.33 



Lowest High- 

 mean, est. 



18.33° 



9.00 

 -1.00 

 12.00 

 15.00 

 19.33 

 23.67 

 40.33 

 40.00 

 60.67 

 53.33 

 57.33 

 62.00 

 60.33 

 67.67 

 63.00 

 60.88 

 43.33 

 39.67 

 33.67 

 31.67 

 22.00 

 13 67 

 13.67 





55^ 



46 



43 



48 



43 



44 



75 



67 



76 



87 



86 



88 



91 



84 



90 



89 



83 



85 



76 



7 



68 



56 



5; 



40 



n 



5 76 30 > 



} 78 23 S 



(68 28 ^ 



j 56 20 i 



(52 11 ^ 



^40 7 S 



Low 

 est. 



17° 



1 

 —6 



5 



2 

 12 

 16 

 35 

 38 

 4 

 48 

 63 

 60 

 57 

 59 

 44 

 41 

 34 

 30 

 23 

 28 

 20 

 11 



7 



Range. 



54° 



59 

 49 



40 



\ - \ 



46 



51 



65 



48 



46 



Average 

 27 years. 



25.66° 



26.25 



32.50 



43.77 



66.19 



66.08 



70.43 



68.56 



60.33 



47.92 



38.00 



28.26 



Mean, 47.30 



Annual range, 97 



663.95 

 47.00 



The mean temperature of 1863 is 47*3 degs., and of the 27 

 years, is 47 dags. The coldest of these years is 44.7 degs. in 

 1843, and the hottest is 48.3 degs. in 1853, a difference of only 

 3.6 degs. 



The range for the year is commonly from 4 or 6 degs. below 

 zero in winter, to 93 or to 96 degs. in summer. In 1862, 1853, 

 1850, 1838, and a few others, the temperature was not below 

 zero here ; at length 9 degs. below was observed with amaze- 

 ment, and on Jan. 18, 1857, the mercury fell to 16 degs. below; 

 on Feb. 6, 1855, to 20 degs. at 9 p. m., and the cold was at the 

 same degree next morning at 7 a. m., and still lower between 

 these two hours, as at 21 degs. below at 10, and at 25 degs. at 

 3J A. m. From 20 degs. below to 96 degs., would be a range of 

 116 degs. ; the greatest range and the greatest cold ever known 

 here at the hours of regular observation. 



The Hot Period. 

 The "heated period" of August closed on the 11th, and 

 began in July 29th, making fourteen days. The mean tempera- 

 ture of this period is 75.8 degs., which is hot enough. But, in 



