266 



METEOROLOGICAL REPORT, 1868, 



Heiffht above Sea 



Jamiaiy . 

 February . 

 March .... 



April 



May 



June 



July ....... 



AlTgUSt .... 



September. 

 October.... 

 November . 

 December . 



Mean for Year 



Height above Sea. , 



DURHAM OBSERVATORY. 



(1) 



352-4 Feet. 

 (2) (3) (4) (5) (6) 



Mean 

 Max. 



40-90 

 47-02 

 50-20 

 54-12 

 64-06 

 69-28 

 72-67 

 69-85 

 62-89 

 52-49 

 43-30 

 44-70 



Mean 

 Min. 



33-45 

 37-61 

 35 30 



38-17 

 44-13 

 47-16 

 50-98 

 49-65 

 48-45 

 ,38-18 

 35-68 

 06-75 



Mean 

 temper- 

 ature 



of 

 month. 



37-18 

 42-32 

 42-75 

 46-14 

 54-10 

 58-22 

 61-83 

 59-75 

 55-67 

 45-33 

 39 49 

 40-73 



48-63 



Mean 

 temper- 

 ature 

 of 

 Air. 



38-10 

 42-63 

 43-19 

 45-68 

 52-95 

 5684 

 60-85 

 59-99 

 o5'14 

 45-15 

 40-52 

 41-50 



48 55 



Mean 

 temper. 



of 

 evapor- 

 ation. 



3606 

 40-19 

 40-96 

 43-68 

 50-59 

 62-57 

 56-03 

 55-72 

 52-03 

 42-89 

 38-84 

 39-72 



45-77 



Dew 

 Point. 



33-29 



37-24 



38-30 



41-38 



48-23 



48-63 



51-88 



51-96 



49-04 



40-27 



36- 



37-50 



42-87 



DURHAJM OBSERVATORY (Continued) 



(7) 



3.52-4 Feet. 

 (8) (9) 



(10)' (11) 



Relative 

 Humidity- 

 Saturation 

 = 100. 



Weight of 

 Vapom- in 



a cubic 

 foot 



of Air. 



Additional 



■weight 



required 



for 



Saturation. 



Mean 



Elastic 

 force of 

 Vapour. 



Weight 



of cubic 



foot of 



Air. 



January 



February 



March 



April 



May 



June 



July 



August 



September . . . 



October 



November . . . 

 December 



Mean for Year 



83 



86 

 84 

 74 



72 

 75 

 81 

 85 



81 



Grains. 

 2-21 

 2-58 

 2-67 

 2-97 

 3-79 

 3-82 

 4-27 

 4-31 

 3-94 

 295 

 2-54 

 2-61 



3-22 



Grains. 

 0-46 

 0-58 

 0-55 

 0-57 

 061 

 1-36 

 1-67 

 1-46 

 0-95 

 0-51 

 0-38 

 0-41 



0-79 



Inches. 

 0-190 

 0-222 

 0-231 

 0-261 

 0-333 

 0-343 

 0-385 

 0-388 

 0-348 

 • 0-250 

 0-218 

 0-225 



0-283 



Grains. 

 547-8 

 544-6 

 542-3 

 540-3 

 534-4 

 532-0 

 527-3 

 524-0 

 529-9 

 540-4 

 548-0 

 536-0 



537-2 



Columns 1, 2, and 3, give the me.ans of the daily readings of the maximum and 

 minimum thermometers, and the mean temperature of the month as deduced from 

 them. Columns 4—11, give the mean temperature of the air and of evaporation, 

 as deduced from observations of the dry and wet bulb thennometers, at 10 a.m., 

 and 10 p.m., together with the hygrom'olrical results deducible from tlicse. 



