METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Lalitude, 42° 23' 48.5" N. Longitude 72° 31' lo" W. 



ffeighi of barometer above ground, 31 ft. Above sea level, 2']'j.^ ft. 



Height of Wind Instruments 72 ft. 



AUGUST. 1905. 



BULLETIN No 200. 



MONTHLY SUMMARY. 



freHSitre. In inches. 

 Maximum reduced to freezing, 29.98, iSth, ioa. 

 Minimum reduced to freezing, 29.26, 30th, 12 p. 

 Reduced! maximum reading, 30.27, iSth, 10 a. 

 Reducedt minimum reading, 29.55,30th, 12 p 



Mean semi-daily reduced. 29.983 



Monthly range 0.72 



*Air Temperature. In Degrees Fahr. 



Highest, S9.0, iTth,i P. : 22d, 3 p. 



Lowest 41.5, 28th, 6 A. 



Mean hourly, 65 



Mean of means of max. and min 66.2 



Mean sensible (wet bulb), 61.2 



Monthly range 47.5 



Highest mean daily, 75.7,12th 



Lowest mean daily 55.0, i6th 



Mean maximum, 77.9 



Mean minimum, 54.6 



Mean daily range 23.3 



Greatest daily range 35.0, 24th 



[-east daily range, 9.0, 15th 



UinnUlitji. 



Mean dew point 59.0 



Mean force of vapor 624 



Mean relative humidity, 82. 5 



Precipitation. In inches. 



Total precipitation, 6.47 



Number of days on which 01 inch or more 

 rain or melted snow fell 15 



* Temperature in ground shelter. 

 t Reduced to freezing and*sea-level. 



Total movement, 3030 m. 



Greatest daily movement 242 m., 12th 



Least daily movement 13 m., 9th 



Mean daily movement 98m. 



Mean hourly velocity, . 4.1m. 



Maximum pressure per square foot, 7.0 lhs.= 



37 ni. per hour, 13th, 3 p., N.E. 

 Prevaihng Direction, South. 

 Summary. 



Northeast, 19 percent. 



South, 13 " " 



South, Southwest, . 13 " " 



Southwest, 10 " " 



Other directions, 45 " " 



Weather. 



Mean cloudiness observed, . . . .56 per cent. 

 Total cloudiness recorded by tlie Sun Ther- 

 mometer i87hrs.=44 per cent. 



Number of clear days, 9 



Number of fair days, 13 



Number of cloudy days, 9 



Krlght SuuHhine, 



Number of hours recorded. . . 242 hrs. = 56jt 

 Rain, 1st, 6th, 8th. 9th, nth, 12th, 15th, 16th, 



20th, 22d, 25th, 26th, 27th, 29th. 30th, 31st. 



Oales, 2S miles or more per hour, 37 m. 13th, 

 N.E. 



Thunder and T,igh tniufj, Gth, 9th, 

 29th, 30th, 31st. 



nth, 



