BULLETIN No. 272. 



AUGUST, 1911 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIUCULTUIUL EXPERIMENT 



STATIOISI. 



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



Height of barometer above ground, J^y/. Above sea level, 2'/j.^ //. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxiiniini reduced to freezing, 30.01 , 30th, 8 P. 

 Miniimiin reduced to freezing, 29.25, i6th, 2 a. 

 Reducedf maximum reading, 30.30, 30th, S v. 

 'Reducedf minimum reading, 29.54, i6th, 2 a 



Mean semi-daily reduced, 30.020 



Montlily range 0.76 



• 



*Air Temperature. In Degrees Fahr. 



Highest 94-5- i^thi 3 p 



Lowest, 44-5. 21st, 6 a 



Mean hourly, 67.8 



Mean of means of ma.x. and min 68.5 



Mean sensible (wet bulb), 62.2 



Montlily range - 50-o 



Highest mean daily, 77-3. lot'i 



Lowest mean daily 54-6. 3ist 



Mean maximum, 80.1 



Mean niinimum, 57-o 



Mean daily range, 23.1 



Greatest daily range, 40.0, 14th 



Least daily range 3-°, 31st 



Huin'ulity. 



Mean dew point, 59-° 



Mean force of vapor, 657 



Mean relative liumidity 77-5 



Precipitation. In inches. 



Total precipitation, 5-92 



Number of days on which .01 inch or more 

 rain fell, • 10 



Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3029m 



Greatest daily movement, .... 2o7ni., igth 



Least daily movement, 2Sm., 26th 



Mean daily movement, 98.0m 



Mean hourly velocity, 4.1m 



Maximum pressure per square foot. 3.0 lbs.= 



24m. per hour, i6th, g A., N. W. 

 Maximum velocity for 5 minutes, 24m. per 



hour, i6th, qa., N.W. 

 Prevailing Direction, West Southwest. 



Summary. 



West 16 percent. 



Northwest 16 " " 



South 13 " " 



South Southeast 13 " " 



South Southwest 10 " " 



North Northwest 10 " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed, .... 61 per cent. 

 Total cloudiness recorded by the Sun 'Jher- 



mometer, 202hrs.=47 per cent. 



Numljer of clear days 7 



Number of fair days, 1(1 



Number of cloudy days, 8 



liriglit Sunshine. 



Number of hours recorded. . . 227 lirs. = ;3'* 

 Kain, ist, nth, 15th, 17th, i8th, 24th, 25th, 

 27th, 2Sth, 29th, 31st. 



Tliunder and liiRlitninR, iSth, 28tli, 2gth. 

 Gales, 35 or mote miles per hour : None. 



