BULLETIN No. 369. 



SEPTEMBER, 1919 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, jr ft. Above sea level, 2jj.^ ft. 

 Height oj Wind Instruments Y 2 ft. Time used, "j^th Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing,3o.o9, 27th, i. 



28th, 8 A. 



Minimum reduced to freezing, 29.27, i2tii, 4 A 

 Reduced maximum reading . 30.39, 27th, S a; 



28th, 8 A. 

 Reduced minimum reading, 29.56, 12th, 4 a 



Mean semi-daily reduced 30.016 



Monthly range 0.83 



*Air Temperatnre. In Degrees Fahr 



Highest 88.0, 7th, 4 P; Sth, 2 p 



Lowest 35.0, 27th, 7 A 



Mean hourly 61 



Mean of means of max. and niin 61 



Mean sensible (wet bulb) 56 



Monthly range . 53.0 



Highest mean daily 74. S, Sth 



Lowest mean daily 50.2, 28th 



Mean maximum 72.4 



Mean minimum 51.4 



Mean daily range 21.0 



Greatest daily range 42.0, 2Sth 



Least daily range 3.5, 3rd 



Hnmidity. 



Mean dew point 54.6 



Mean force of vapor 525 



Mean relative humidity 84.2 



Precipitation. In inches. 



Total precipitation, in inches 4,25 



Total snow, in inches 



Number of days on which .01 inch or more 

 rain fell 12 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 3244 m 



Greatest daily movement 235m, 22d 



Least daily movement .... 35ni, lotii 



Mean daily movement loSm 



Mean hourly velocity 4-5 m 



Maximum pressure per square foot, 4.5 lbs 



30m per hour, 25th, 3P, S.S.W. 

 Maximum velocity for 5 minutes, 20m per 



hour, 2Sth, 2P, S.S.W. 

 PrevaiUng direction. Southwest. 



Summary. 



South 27 per cent 



South Southwest 17 " " 



North 13 •' " 



North Northeast 13 " " 



West 10 " " 



Other directions 20 " " 



Weather. 



Mean cloudiness observed .... 54 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 194 hours = 52 per cent. 



Number of clear days 9 



Number of fair days 9 



Number of cloudy days 12 



Bright Sunshine. 



Number hours recorded, 179 hrs,= 48 per cent. 

 Rain, 2d, 3d, 7th. 9th, loth, nth, 12th, 15th, 



i6th, 20th, 22d, 23d, 24th. 

 Thunder and Lightning, 9th. nth, 24til. 

 Frosts. iSth, 27th, 2Sth. 

 Gales. 35 miles or more per hour: None- 



