BULLETIN No. 237. 



SEPTEMBER, 1908. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGKICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, ^73'S f^- 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



freBSure. In inches. 



Maxiimiiu reduced to freezing, 30 15, 15th, gA. 

 Mininiuni reduced to freezing, 29.43, 2d, 4 p. 

 Reducedt maximum reading, 30.45, 15th, 9. '\ 

 Ileducedt minimum reading, 29.72, 2d, 4 p. 



Mean semi-daily reduced, 30.100 



Monthly range • 0.73 



*Air Temperature, In Degrees Fahr. 



Highest, 8S.0, nth, 3 p 



Lowest, 33.0, 30th, 6:30 A 



Mean hourly, 62.9 



Mean of means of max. and min 64.0 



Mean sensible (wet bulb), 56.6 



Monthly range 55.0 



Highest mean daily 71.3,11th 



Lowest mean daily, 48.S, 30th 



Mean maximum, 77.5 



Mean minimum, S°-S 



Mean daily range, 27.0 



Greatest daily range, 41.0, 9th 



Least daily range, 6.0, 6th' 



Hutniditt/. 



Mean dew point 53.5 



Mean force of vapor, 539 



Mean relative humidity, 79.1 



Precipitation. In inches. 



Total precipitation, 1.73 



Number of days on which .01 inch or more 

 rain or melted snow fell, 4 



• Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3757ni. 



Greatest daily movement, .... 26901., 29th. 



Least daily movement 27m. ,23d. 



Mean daily movement 125 m. 



Mean hourly velocity, 5.2 m. 



Maxinmm pressure per square foot, 9.0 lbs.= 



42m. per hour, 29th, OA., S.S.E. 

 Maximum velocity for 5 minutes, 27m. per 



hour 29th, OA., S.S.E. 

 Prevailing Direction, Southwest. 



Summitry. 



South 20 per cent 



North Northwest 10 " " 



West Northwest 10 " " 



West Southwest 10 " " 



South Southeast, 17 " " 



Other directions, .33 " " 



Weather. 

 Mean cloudiness observed, - . . .27 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 131 hrs.=35 per cent. 



Number of clear days 7 



Number of fair days, 19 



Number of cloudy days, 4 



liriffht Sntiahine. 

 Number of hours recorded, . . 242 lirs. =6556 

 Rain, 2d, 6th, 2Sth, 29th. 

 Thunder and Lightning — 2Sth, 29th. 

 Frogt, i6th, 30th. 



Oales, 35 miles or more per honr ; 35m., 

 14th, N.N.W.; 41m. 2Sth, S.S.E.: 42m.. 

 29th, S.S.E. 



