BULLETIN No. 333. 



SEPTEMBER, 1916 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Hei^^ht of barometer above ground, ^i ft. Above sea level, 2'/j.^ ft. 

 Height oj Wind Instnimaits 72 ft. 



MONTHLY SUMMARY. 



Pressute. In inches. 

 Maximum reduced to freezing, 30.24, nth, 10 A 

 Minimum reduced to freezing, 29.38, 8th, 2 p 

 Reducedt maximum reading, 30.53, nth, 10 A 

 Reducedt minimum reading, 29.66, 8th, 2 p 



Mean semi-daily reduced 30.036 



Monthly range 0.87 



*Air Temperature. 



Highest 



In Degrees Fahr. 



. . 89.5, 14th, 3 P 



Lowest 36.5, 20th, 6 A 



Mean hourly 60.8 



Mean of means of max. and min 61.3 



Mean sensible (wet bulb) 55.5 



Monthly range 53 



Highest mean daily 74.9, 8th 



Lowest mean daily 5o-o, 30th 



Mean maximum 73-9 



Mean minimum 48.6 



Mean daily range 25.3 



Greatest daily range 41.5,14th 



Least daily range 6.0, 6th 



Humidity. 



Mean dew point 52.6 



Mean force of vapor 510 



Mean relative humidity 81.3 



Precipitation. In inches. 



Total precipitation, in inches 5.08 



Number of days on which .01 incii or more 



rain fell 



• Temperature in ground shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 3717^ 



Greatest daily movement 320m, 29th 



Least daily movement 35ni, 14th 



Mean daily movement 124 m 



Mean hourly velocity 5.2 m 



Maximum pressure per square foot, 9.5 lbs =« 



44m per hour, 29th, 2 p, .S. 

 Maximum velocity for 5 minutes, 24m per 



hour, 29th, 2P, S. 

 Prevailing direction, West Southwest. 



Summary. 



North Northwest 10 per cent 



South Southwest 30 " " 



West South w^est 10 " '" 



South 13 " " 



Other directions 37 " " 



Weather. 



Mean cloudiness observed .... 45 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 118 hours = 32 per cent 



Number of clear days 16 



Number of fair days lo 



Number of cloudy days 4 



Bright Sunshine. 



Number hours recorded, 255 hrs, = 68 per cent 

 Rain, 5th, 6th, 7th, 8th, 15th, i8th, 19th, 23d, 



28th, 29th. 

 Thunder and Li^htninil, I5th, l8th, 29th. 

 Frosts. 17th, 20th, 26th. 

 Galea, 35 or more miles per hour. 44m, 29th, 



S. 



