BULLETIN No. 344. 



AUGUST, 19 17 



Meteorolooical Observations 



o 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Hcii^ht of barometer above groimd, S^ ft- Above sea level, 2"/^.^ ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.00, 31st, 12 m 

 Mininuim reduced to freezing, 29.31, 24th, 3 P 

 Reduced! maximum reading, 30.29, 31st, 12 m 

 Reducedt minimum reading, 29.S9, 24th, 3 p 



Mean semi-daily reduced 30.005 



Monthly range 0.70 



*Air Temiierature. In Degrees Fahr. 



Highest 98.0, ist, 4 p 



Lowest 46.0, 27th, 4 A 



Mean hourly 70.9 



Mean of means of max. and niin 72.3 



Mean sensible (wet bulb) 6t;.6 



Monthly range 52.0 



Highest mean daily 83.2, ist 



Lowest mean daily 62.2, 26th 



Mean maximum 84.3 



Mean minimum 60.4 



Mean daily range 23.9 



Greatest daily range 39.5, 27th 



Least daily range 10.5, 23d 



Humidity. 



Mean dew point 63.2 



Mean force of vapor 73S 



Mean relative humidity 80.0 



Precipitation. In inches. 



Total precipitation, in inches 7.06 



Number of days on which .01 inch or more 

 rain fell 13 



•Temperature in ground shelter. 

 ** Reduced to freezing and sea-level. 



Wind. 



Total movement 2548 m 



Greatest daily movement 251m, 28th 



Least daily movement 21m, 13th 



Mean daily movement 82.0 m 



Mean hourly velocity 3-4 ni 



Maximum pressure per square foot, 3.5 lbs = 



26 m per hour, 2d, 9th, 20th, 28th. 

 Maximum velocity for 5 minutes 15m per 



hour, 2Sth, 2 p, N.E. 

 Prevailing direction. South Southwest. 



Summary. 



South Southwest 10 per cent 



South 19 " " 



Noith Northwest 16 " " 



West 13 " " 



Other directions 42 " " 



Weather. 



Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .142 hours = 33 per cent 



Number of clear days 12 



Number of fair days 16 



Number of cloudy days 3 



Bright Sunshine. 



Number hours recorded, 2S7 hrs, = 67 per cent. 

 Rain. 8th, 9th, loth, 14th, 15th, i6th, 17th, 



i8th, 2ist, 22d, 23d, 24th, 29th, 30th, 31st. 

 Hail, 2ist. 

 Thunder and Li(ihtninS.9th,I0th,l5th,i7th, 



2ISt, 24th, 29th, 30th. 



Gales. 35 or more miles per hour. None. 



