METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, ^i ft. Above sea level, 273-5 ff\ 

 Height of Wind Instrmnetits 72 ft. ' 



BULLETIN No. 128. AUGUST. 1899 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maximum reduced to freezing, 30.02, 29th, g a 

 Minimum reduced to freezing, 29.47, 5th, 2 r 

 Reducedt maximum reading, 30.31, 29th, Q a. 

 Reduced! minimum reading, 29.75, 5th, 2 r 



Mean tri-daily reduced, 29.977 



Monthly range • 56 



*Air Temperature. In Degrees Fahr. 



Highest, 92.0, 2ist, 2-30 p 



Lowest, 41.0, 9th, 5 A 



Mean hourly, 68.0 



Mean of means of max. and min., .... 68.6 



Mean sensible (wet bulb), 63.4 



Monthly range 51.0 



Highest mean daily, 76.6, 20th 



Lowest mean daily, 57.6, loth 



Mean maximum, 81. i 



Mean minimum, 56.0 



Mean daily range, 25.1 



Greatest daily range, 40.0, iSth 



Least daily range, 6.5, 24tli 



Utitnidity. 



Mean dew point, 59.4 



Mean force of vapor 750 



Mean relative humidity, . . . • ... .74.1 



Precipitation. In inches. 



Total precipitation, . • 2.00 



Numter of days on which .01 inch or more 

 rain or melted snow fell, 4. 



Wind. 



Total movement, 2522 m- 



Greatest daily movement, ■ . . . i7Sm. ,14 th 



Least daily movement, 37 m., ist 



Mean daily movement, 81.3 m. 



Mean hourly velocity, 3.4 



Maximum pressure per square foot, 5.5 lbs.= 



33 m. per hour, on 14th, S a., N. 

 Prevailing Direction, South. 



Summary. 



North, 16 per cent. 



East northeast, 10 " " 



South, 10 " " 



South, southwest, 19 " " 



Southwest, 13 " " 



Other directions, 32 " " 



Weather. 



Mean cloudiness observed, .... 57 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 224 hrs.=52 per cent. 



Number of clear days, 4 



Number of fair days, 12 



Number of cloudy days, 15 



Bright Sunshine. 



Number of hours recorded, . . . 206 hrs.=485( 

 Rain, 5th, ioth,2ist, 22d, 24th, 25th. 

 Thunder and Lightning , 21st, 22d. 



Qales, 35 miles or more per hour, none. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



