BULLETIN NO. 321. SEPTEMBER, 1915 



Meteorological Observations rvi£:i^**^cki^;ae 



""""" JAN 2 41916 



MASSACHUSETTS ^ 



AGRICULTURAL EXPERIMENTS^ 



STATION. 



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



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

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressme. In inches. 

 Maximum reduced to freezing, 30.09, ist, g A.; 



2d, S A. 

 Minimum reduced to freezing, 29.05, 26th, 6 p 

 Reduced! maximum reading, 30.37, ist, 9 a; 



2d, 8 a. 

 Reducedt minimum reading, 29.34, 26tli, 6 p 



Mean semi-daily reduced 30.050 



Monthly range 1.03 



*Air Temperature. In Degrees Fahr. 



Highest 93.0, 9th, 4 p; 15th, 1:30 p 



Lowest 34.5,30th, 5:30 a 



Mean hourly 64.2 



Mean of means of max. and min 66.0 



Mean sensible (wet bulb) 59.3 



Monthly range 58-5 



Highest mean daily 79-4i i5th 



Lowest mean daily 48.6, 28th 



Mean maximum 78-1 



Mean minimum 53-9 



Mean daily range 24.2 



Greatest daily range 36.0, 30th 



Least daily range 13.5, _ 6th 



Hnmidity. 



Mean dew point 56 



Mean force of vapor 601 



Mean relative humidity 80.S 



Precipitation. In inches. 



Total precipitation 1.3 



Number of days on which .01 inch or more 



rain fell 7 



* Temperature in ground shelter. 

 I Reduced to freezing and sea-level. 



Wind. 



Total movement 3332 m 



Greatest daily movement 373ni, 27th 



Least daily movement 15 m, 2d 



Mean daily movement mm 



Mean hourly velocity 4.6 m 



Maximum pressure per square foot, = 



54 m per hour, 26th, up, W. 

 Maximum velocity for 5 minutes, 48 m per 



hour, 26th, 7 p, W. 

 Prevailing direction. Southwest. 



Summary. 



South 40 per cent 



Northwest 17 " 



West 10 " " 



Other directions 33 " " 



Weather. 



Mean cloudiness observed .... 53 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 192 hours = 51 per cent 



Number of clear days 4 



Number of fair days 16 



Number of cloudy days 10 



Bright Sunshine. 



Number hours recorded, 181 hrs, =|49 per cent 

 Rain. 7th, 13th, 14th, i6th, 17th, 19th, 21st, 24th, 



26th. 

 Thunder and Liiihtning. 13th. i6th. 17th, 



2ist. 



Frosts, 23d. 



Gales, 35 or more miles per hour: 35m, 21st, 

 W.N.W.; 54m, 26th. W.: 39m, 27th, W. 



