METEOROLOGICAL OBSERVATORY 



llatcli Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



I..ititiide. 42° '23' 48.5" N. Longitude, 72° 31' 10" VV. 



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



BULLETIN No 72. 



DECEMBER, 1894. 



MONTHLY SUMMARY. 



Press II re. In inches. 

 Actual maximum reading, . . 30.32,24th, 4 a. 

 Actual minimum reading, . 29.00, 27th, 12 M 



Mean re<luced to sea level 30.148 



Monthly range 1.22 



*Air Temperature. In Degrees Fahr. 



Highest, 49, 22nd.; 51; 15th 



Lowest, 4, 29th; -4., 30th 



Mean, 28.5; 26.9 



Monthly Range, 45. ; .56 



Highest mean daily, 44.2, 42. 



Lowest mean dailj' 8., 7. 



Mean maximum, 35.; 36.8 



Mean minimum, 21.6; 17.1 



Mean daily range, 13.4; 19.7 



Greatest daily range, 28. ; 37. 



Least daily range, 4. ; 6.5 



Hiiinidity. 



.Mean dew point, 22.3 



Mean foi-ce of vapor 1650 



Mean relative humidity, 79 



Wind. 

 Prevailing Directions. 



.\orth 21 per cent. 



North West, 15 " " 



South, 13 " " 



South West, 9 " " 



Other directions, 42 " " 



Total movement, 3.508 m. 



Greatest daily movement, . . . 346 m., 13th 

 Least daily movement 5ni.;Ist 



Mean daily movement, 113 m. 



Mean hourly velocity, 47 m. 



Maximum pressure per square foot, 15 lbs.= 

 55 m. per hour, 13th, at 9 A. 



* Precipitation. In inches. 



Total precipitation 3.53 



WeatJier. 



Mean cloudiness observed, . . 44.4 per cent. 



Number of clear days, 12 



Numberof fair days, 6 



Number of cloudy days 13 



Total cloudiness recorded by the Sun Tlier- 



mometer, . . . 124 hours or 43.8 per cent. 

 Number of days on which .01 inch or more 



rain or melted snow fell, 11 



Number of inches of snow on the ground at 



the close of the month 6 



Uriffht Sunshine, 



Number of Hours recorderl 159 



Rain 2d, nth, 12th, 17th, 21st 



.'inotv, lst,2d,sth,9th, llth,24th,25th26th,27th 



Total fall in inches, 21 



Mean Ozone, 26.4 per cent. 



Halos. 



Solar, 19th, 24th, 26th 



Lunar, lOih, 19th 



Gales, of 35 or more miles per hour, 41, 3rd, 



N.W.; 35, lOih, N.E.; 5.1, 13th, N.N.W.; 



41, 17th, N.W.; 37, 18th, N.W.; 36, 23d,N.; 



51, 2,5th, N.W.; 41,27th, N-N.E.; 35,29th,N. 



*TI)e lirst figures denote readings at top of tower, the second at base. 



