METEOROLOGICAL OBSERVATORY 



Ilatcli Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



r.atitiule, 42° 23' 48.5" N. Lonoitude, 72^ 31' 10" W. 



Height of instruments above ground^ 51 ft. Above sea level., 260 ft. 



BULLETIN No. 84. 



DECEMBER, 1895. 



MONTHLY SUMMARY- 



Pressure, lu inches. 

 .Actual luaxiinura reading, . 30. .i5, 10 A., ITtli 

 Actual minimum reading, . . -28.77, 5 a., 31sl 



Mean reduced to sea level, 30.1.il 



Monthly range 1.7S. 



*Air Temperature, In Degrees Falir. 



Highest 58, 31st;65, iethj 



Lowest 4,-3, 13th 



Mean .5-2.0 



-Monthly Range, .i4. ; 68. 



Highest mean daily, 47.1, •20th 



Lowest mean daily, 10.2,13th 



Mean maximum, 38.9; 41.1 



Mean minimum •25.5; 19.8 



Mean daily range, 13.4; '21.3 



Greatest daily range, . . . '25. 31st; 37. 30th 



Least daily range 2, .'jth ; 9, 25th 



Hiimiditt/. 



Mean dew point, 23.6 



Mean force of vapor, 193 



Mean relative humidity, . 75.4 



Wind. 

 Prevailing Directions. 



North, 19 per cent. 



South 13 " " 



.North West, 10 " " 



South South West 16 " " 



South West 10 " " 



West 10 " •' 



Other directions, 22 " " 



Total movement 5506 m. 



Greatest daily movement, . . . 454 m., 3l8t 



Least daily movement 27 m.; 25th 



.Mean daily movement, 177.6 m- 



Mean hourly velocity, 7.4 m. 



Maximum pressure per sqiuire foot, 24 lbs.= 

 69 m. per hour, 27th, 4 A.M. 



*Precipitation. In inches. 



Total precipitation, 2.09, 3.94 



Number of days on which .01 inch or more 



rain or melted snow fell, 8 



Snow total in inches, 8 



WeatJier. 

 Mean cloudiness observed, ... 45 per cent. 

 Total cloudiness recorded by the Sun Tlier- 

 mometer, . . . 114 hours or 40 percent. 



Number of clear days 7 



Numberof fair days, 14 



Number of cloudy days, 10 



Bright Smishine, 



Number of Hours recorde<l, ... 169 or 605« 



Rain, . . 2d, 21st, 2-2d, •26th, 27th, .30th, 3l8t. 



Oales, of 35 or more miles per hour, 35, 2d, 



S.S.W.; 36, 13th, N.; 41,14th, N.N.E.;35, 



l.lth, N.N.W.; .35, 16th,N.; 37, 22d, W; 44, 



26th, S.E.; 63,27th, W.N.W.; 62,31st,S.W. 



Snotv, . . . Sin. 5th; 7th, 91h, 11th, a trace. 



Lunar Halo, 23d. 



*The first figures denote readings at top of tower, the second at base. 



