BULLETIN No. 325. 



JANUARY, 1916 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground^ 51 ft- Above sea levels 273-5 fi- 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



PressnTe. In inches. 



Maximum reduced to freezing, 30.31, 8th, 9 a; 



2Qth, 10 A. 

 Minimum reduced to freezing, 29.17, 5th, 12 p 

 Reducedt maximum reading, 30.64, 8th, 9 A 

 Reducedt minimum reading, 29.47, 5th, 12 p 



Mean semi-daily reduced 30.184 



Monthly range 1.17 



*Air Temperature. In Degrees Fahr. 



Highest 57.5, 28th, 9:30 A 



Lowest —5-0, 15th, 7 :30A 



Mean hourly 27.9 



Mean of means of max. and min 27.7 



Mean sensible (wet bulb) 25.8 



Monthly range 62.5 



Highest mean daily 49.1, 27th 



Lowest mean daily 8.2 15th 



Mean maximum 36.1 



Mean minimum 19.5 



Mean daily range -. . . . 16.6 



Greatest daily range 32.0, 28th 



Least daily range 6.0, 12th 



Hamidity. 



Mean dew point 21.4 



Mean force of vapor 166 



Mean relative humidity 81.4 



Precipitation. In inches. 



Total precipitation 2.56 



Number of days on which .01 inch or more 



rain fell 9 



Total snow in inches 5.0 



• Temperature in gjround shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 6341 m 



Greatest daily movement 435m, 14th 



Least daily movement I7ni, ist 



Mean daily movement 205 m 



Mean hourly velocity 8.5 m 



Maximum pressure per square foot, 25.0 lbs = 



71 m per hour, 23d, i A, W. 

 Maximum velocity for 5 minutes, 36m per 



hour, 23d, I A, W. 

 Prevailing direction. West. 



Summary. 



North 19 per cent 



South Southwest '3 " " 



West 16 " " 



South 13 " " 



Northwest 16 " " 



Other directions 23 " " 



Weather. 



Mean cloudiness observed .... 44 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 154 hours = 52 per cent 



Number of clear days 13 



Number of fair days 3 



Number of cloudy days 15 



Bright Sunshine. 



Number hours recorded, 140 hrs, = 48 per cent. 

 Rain, ist, 2d, 3d, 5th, loth, 13th, 20th, 27th, 

 30th. 



Hail, ist, 2d, 20th. 



Snow, 2d. 3d, loth, i6th, 17th, 20th, 30th. 



Days of Sleighinti, 23. 



Gales, 35 or more miles per hour; 35m, 4th, 

 S.S.W.; 36m, 5th, S.S.W.: 44m, 6th, 

 N.W.; 40m, 14th, N.W.; 41m, 17th, 

 W.N.W.; 59m, 22d, W.; 71m, 23d,W.; 44m, 



2Sth, W.S 



; 59m 

 s.w. 



