128 



TWENTIETH ANNUAL REPORT OF THE REGENTS, 



METEOROLOGICAL OBSERVATIONS, 



Rochester, 1866, at 7 a. m., 2 p. m. and at 9 p. m. 



TABLE L 



IiesuUsfrom the Theiinometer. 



MONTH. 



Jan. 



Feb. 



March 



April 



May 



June 



July 



August 



Sept. 



Oct. 



Nov. 



Dec. 



First half, 

 Sec'd half. 



First half, 

 Sec'd half, 



17.78° 

 25.44 



24.19 

 27.05 



32.32 

 27.64 



45.82 

 51.56 



51.17 

 53.33 



65 89 

 67.98 



75.93 

 72.85 



64.93 

 60.48 



61.85 

 53.70 



52.64 

 49.37 



41.11 

 38.11 



29.09 

 22.96 



Mean. 



Highest Lowest 

 ean. mean. 



21.73 

 25.62 

 29.89 

 48.69 

 52.43 

 66.93 

 74.33 

 62.63 

 57.79 

 50.95 

 39.61 

 25.92 



34.33° 

 38.67 



39.33 

 48.00 



49.33 

 38.00 



65.00 



72.00 



69.00 

 70.67 



72.00 

 80.33 



86.33 

 86.00 



68.67 

 66.33 



73.67 

 62.67 



65.33 

 66.33 



61.33 

 55,00 



50.33 

 40.67 



-0.67 

 11.67 



9.67 

 3.67 



19.67 

 15.00 



33.33 

 36.33 



40.33 

 44.33 



56.00 

 56.33 



66 . 33 

 66.33 



60.00 

 53.33 



46.67 

 46.33 



38.33 

 36.00 



30.00 

 24.33 



12.67 

 5.00 



High- 

 est. 



38° 

 42 



45 

 53 



58 

 44 



75 



85 



80 

 86 



84 

 91 



93 

 95 



76 

 74 



81 

 70 



75 

 76 



58 

 58 



54 

 43 



Low- 

 est. 



Range. 



Gen'ral 

 av'raffe 



-4 



7 



3 

 -3 



10 

 12 



30 

 33 



37 



54 

 54 



60 

 63 



68 

 48 



42 

 36 



29 

 32 



21' 

 24 



12 



46° 



56 



48 



56 



49 



37 



35 



38 



45 



47 



37 



63 



Month 

 ly ay. 



25.56 

 25.00 



24.09 

 27.23 



30 . 24 

 34.41 



41.35 

 47.14 



52,87 

 59.00 



63.40 

 69.05 



70.38 

 71.04 



69.97 

 66.93 



64.06 

 56.92 



51.36 

 45.13 



41.18 

 35.11 



31.03 



25.72 



25.22 

 25,65 

 32.37 

 44.23 

 66.20 

 66.20 

 70,70 

 68.41 

 60.49 

 48.14 

 38.14 

 28.63 



Mean 46.38; Annual Range 104; General Average 47.03 of thirty years. 



On three of the five cold days in January the temperature was below 

 zero, on the last or 9th 4° below; but the barometer rose to the highest 

 ever known here, 30.52 inches. December 21st was the coldest known 

 here for that month, 9° below, and the barometer 30.05. 



