BULLETIN No. 354. 



JUNE, 1918 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, ^r ft. Above sea level, 27 j.^ ft. 

 Height oj Wind Ifistruments J2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 29.04, 20th, 8 A 

 Minimum reduced to freezing, 29.02, i2tli, 3 p 

 Reduced maximum reading . . 30.24, 2otli, 8 A 

 Reducedt minimum reading, . 29.31, 12th, 3 p 



Mean semi-daily reduced 29.920 



Monthly range . 0.93 



*Air Temperature. In Degrees Fahr. 



Highest 93.0, ist, 3:30 P. 



Lowest 40.0, 20th, 5 A; 



2ISt, 1^:30 A 



Mean hourly 62.9 



Mean of means of max. and min 63.0 



Mean sensible (wet bulb) 57.3 



Monthly range 53 



Highest mean daily 79.S, 2d 



Lowest mean daily 51.2, 23d 



Mean maximum 75.0 



Mean minimum 51.0 



Mean daily range 24.0 



Greatest daily range 41.0, i6th 



Least daily range 6.0, 23d 



Humidity. 



Mean dew point 53.3 



Mean force of vapor 5S1 



Mean relative humidity 72.9 



Precipitation. In inches. 



Total precipitation, in inches 4.01 



Number of days on which .01 inch or more 



rain fell 9 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 3858 m 



Greatest daily movement 332m, 7th 



Least daily movement 24ml 25th 



Mean daily movement 129 m 



Mean hourly velocity 5-4 m 



Maximum pressure per square foot, 4.5 lbs = 



30m per hour, 3d, 6 p, N.W.; 7th, 5:30 p, S. 

 Maximum velocity for 5 minutes, 24m per 



hour, 3d, 6 p, N.W. 

 Prevailing direction, West Southwest. 



Summary. 



South 23 per cent 



Northwest 13 " 



South Southwest 13 " 



West 10 " 



North Northwest 10 " 



Other directions 31 " 



Weather. 



Mean cloudiness observed .... 41; per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .192 hours = 42 per cent 



Number of clear days 9 



Number of fair days 13 



Number of cloudy days 8 



Briiiht Sunshine. 



Number hours recorded, 265 hrs, = 58 per cent 

 Rain. 4th, 6th, 7th, gth, loth, 12th, 13th, 



17th, 2ISt, 22d, 23d. 



Thunder and Liahtninig. 6tli, 12th. 

 Gales, 35 miles or more per hour :sNone 



