BULLETIN No. 248. 



AUGUST, 1909 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPERIMENT 



STATION . 



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



Height of barometer above ground, ^i ft. Above sea level, zyj.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Freaaure. In inches. 



Maxinuuu reduced to freezing, 3010, 3d, 7 A. 

 Mininiiiin reduced to freezing, 29.13, iSth, 3 P. 

 Reducedl maxinuun reading, 30.39, 3d, 7 A. 

 Reducedt niininuim reading, . 29.42, 18th, 3 p. 



Mean semi-daily reduced, 30.023 



Monthly range 0.97 



*.4.ir Temperature. In Degrees Fahr. 



Highest 940, Sth, 4 p. 



Lowest 3S.o,3ist, 5.30 A. 



Mean hourly, 66.5 



Mean of means of max. and min 66.8 



Mean sensible (wet bulb), 60.9 



Monthly range 56.0 



Highest mean daily, 76.9, Sth 



Lowest mean daily, 56.0, 31st 



Mean maximum 7fl-9 



Mean minimum, 53-8 



Mean daily range 26.1 



Greatest daily range, 3S-o, 12th 



Least daily range, 6.0, 17th 



ITiitnidit;/. 



Mean dew point, 57-8 



Mean force of vapor, 636 



Mean relative humidity, 78.1 



Precipitatiou. In inciies. 



Total precipitation, 3.79 



Number of days on which .01 incli or more 

 rain or melted snow fell, • 8 



Wind. 



Total movement 3485ni. 



Greatest daily movement, . . . . iS6m., 5th. 



Least daily movement 47m., 8th. 



Mean daily movement, 112m. 



Mean hourly velocity, 4.7 m. 



Maximum pressure per square foot, 3.0 lbs.= 



24 m. per hour, 15th, i p., W.S.W. 

 Maximum velocity for 5 minutes, 21m. per 



hour loth, 8 A., N. 

 Prevailing Direction, West Northwest. 

 Summary. 



West Northwest 13 percent. 



North Northwest 13 " 



North 10 " " 



East Southeast 10 " '' 



Southeast 10 " " 



West Southwest 10 " " 



Other directions, 34 " " 



WentJier. 

 Mean cloudiness observed, . • • • 35 per cent. 

 Total cloudiness recorded by the Sun 'iher- 



mometer, . . . i88hrs.=44 per cent. 



Number of clear days 8 



Number of fair days, 14 



Number of cloudy days 9 



Bright S^tnshine. 

 Number of hours recorded, . . 241 hrs. = 56?S 

 Kain, 4th, 5th, 6th, 13th, i6th, 17th, i8th, 



20th, 26th, 29th. 

 Thunder and Lightning, 20th. 

 Gales, 35 miles or more per honr ; none 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



