METEOnOLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 48.5" N. Longitude, 72° 31' 10" W. 



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



BULLETIN No. 60. 



DECEMBER, 1893. 



MONTHLY SUMMARY. 



yressiire. In inches. I Mean daily movement, 126 m. 



. ^ , . -,. „ , , iMean hourly velocity 5.2 m. 



Actua maximum rea.ling, . 30.61, 14th, 9 A. ^Maximum pressure per square foot.lSJ lb8.= 

 Actual minimum reacUng, 29.uy,lMh, S 30 P. (ii^,. ^qj. houj., '26ih, at 5-30 A. 



Mean reduced to sea level 30.121 



Monthly range 1.52 * Precipitation. In inches. 



*Air TemperaUire. In Degrees Fahr. Total precipitation 3.85; 4.86 



Highest, 51,; 52, S.'ith Weather. 



Lowest — 2 ; —12, Hth.Mean cloudiness observed, . . . 54 per cent. 



Mean, 2S.2 ; 25 5. 1 Number of clear days, 7 



Monthly Range 53. ; 64. i Number of fair days, 6 



Highest mean daily, 47.3; 44.5|Number of cloudy "days, 18 



Lowest mean daily 5.5; 0. iTotal cloudiness recorded by the Sun Ther- 



Meau maximum 34. ; 35.2| mometer 171 hours or 60 per cent. 



Mean minimum 21.9; 15.9 Number of days on which .01 inch or more 



Mean daily range, 12.; 19.3 



Greatest daily range 28. ; 34. 



Least daily range 2. ; 8. 



Htiniidity. 



Mean dew point 21.9 



Mean force of vapor 1632 



Mean relative humidity, 80.9 



Wind. 



Prevailing Directions. 



North West 22 per cent. 



North 18 " " 



South, . 18 " " 



South South West 8 " " 



Other directions, 34 " " 



Total movement 3916 m. 



Greatest daily movement, . . . 351 m., 2fith. 

 Least daily movement, 11m.; 15th. 



rain or melted snow fell, 16 



Number of inches of snow on the ground at 

 the close of the month, 3 



Bright Sunshine. 



Number of Hours recorded, 112 



Kain. I st,3d, 4th, 15th, 16th, 17th,23d,24th, 29th. 

 Snow. 3d, 5th, 9th, 12th, 14th, 15th, 19th, 2j)th, 

 30th, 31st. 



Total fall in inches, 14$ 



Hail, 3rd, 15th. 



Mean Ozone, 26 per cent. 



Thunder and Lightning, 3d. 



Hal OS. 



Solar, 9th, 14th. 



Lunar ■ 21st. 



Oalfs, of 35 or more miles per hour, 37, 2nd, 



W.N.W.; .i3 llih.W.N.W. ; 41, 12th, N.W.; 



36, 13th, N.W.; :i5, 17th, W.N. W.; 47,20th, 



N.W. ; 61, 26th, N. 



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



