BULLETIN No. 330. 



JUNE, 1916 



Meteorological Observations 



MASSACHUSETTS 



AGllICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground^ 51 ft. Above sea level, 2"/^.^ ft. 

 Height oj Wind Instruments 12 ft. 



MONTHLY SUMMARY. 



PressuFe. In inches. 

 Maximum reduced to freezing, 29.83, i6th, 11 A 

 Minimum reduced to freezing, 29.31, 3d, 12 p 

 Reducedt maximum reading, 30.13, i6th, 11 A 

 Reducedt minimum reading, 29.61, 3d, 12 p 



Mean semi-daily reduced 29.945 



Monthly range 0.52 



*Air Temperature. In Degrees Fahr. 



Highest 84.0, 28th, 3 P 



Lowest 40.0, 2d, 4:30 A 



Mean hourly 61. i 



Mean of means of max. and min 61.3 



Mean sensible (wet bulb) 57.0 



Monthly range 44 



Highest mean daily 72.0,28th 



Lowest mean daily 49.8 10th 



Mean maximum 71.3 



Mean minimum 51.2 



Mean daily range 20.1 



Greatest daily range 40.5, 2d 



Least daily range 5.0, 9th 



Humidity. 



Mean dew point 53.3 



Mean force of vapor 0.556 



Mean relative humidity 75.7 



Precipitation. In inches. 



Total precipitation 5.34 



Number of days on which .01 inch or more 



rain fell 13.0 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3226 m 



Greatest daily movement 229m, 22d 



Least daily movement 23m, i6th 



Mean daily movement 108 m 



Mean hourly velocity 45 ni 



Maximum pressure per square foot, 7.0 lbs = 



37 m per hour, 22d, 11 a, N.W. 

 Maximum velocity for 5 minutes, 24m per 



hour, 22d, 12 M, N.W. 

 Prevailing direction, Northeast. 



Summary. 



North Northwest 10 per cent 



North Northeast 10 



South 17 



Northeast 10 



West Northwest 10 



Other directions 43 



Weather. 



Mean cloudiness observed .... 62 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 301 hours = 66 per cent 



Number of clear days 4 



Number of fair days 10 



Number of cloudy days 16 



Bright Sunshine. 



Number hours recorded, 156 hrs, = 34 per cent 

 Rain, 3d, 5th, 7th, 8th,9th,iith, 12th, 13th, i6th, 



17th, iSth, 19th, 2ist, 25th. 

 Thunder and Lightning, ist, 5th, 12th, 



13th, iSth. 

 P'rosts, 

 Gnles, 35 or more miles i)er hour. 36m, 4th, 



N.W.; 37m, 22d, N.W. 



