METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 ft. Above sea level, 2^3.5 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 152. 



AUGUST, 1901 



MONTHLY SUMMARY. 



Preasure. In inches. 

 Maximum reduced to freezing, 29.99, 6th, 12 m. 

 Minimum reduced to freezing, 29.48, 15th, 10 i\ 

 Reducedt maximum reading, 30.28,6th, 12 M. 

 Reducedt minimum reading, 29.76, ist, a.' 

 15th, 10 P. 



Mean tri-daily reduced 30-024 



Monthly range • 5' 



*Air Temperature. In Degrees Fahr. 



Highest S6.5, 2ist, 4 P-, 24th, 3 p. 



Lowest 530. 17th, 3-30 A. 



Mean hourly, 69.9 



Mean of means of max. and min., .... 70.4 



Mean sensible (wet bulb), 65.6 



Monthly range, 33.5 



Highest mean daily, . ....... 75.0, 21st 



Lowest mean daily, 64.3, 6th. 



Mean maximum, 81.2 



Mean minimum, 59.6 



Mean daily range 21.6 



Greatest daily range, 29.0,8th. 



Least daily range, 12.0, 22d- 



Hiitnidity. 



.Mean dew point 62.3 



Mean force of vapor, 771 



Mean relative humidity, 76.3 



Precipitation. In inches. 



Total precipitation, . • 6.14 



Number of days on which .01 inch or more 

 rain or melted snow fell, 14 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 2144m. 



Greatest daily movement, • . . . 199 m., 10th 



Least daily movement, 11 m., J3th 



Mean daily movement, 69.2 m. 



Mean hourly velocity, 2.9 m. 



Maximum pressure per square foot, 2.0 lbs.= 



20 m. per hour, 8th, loth, 15th. 

 Prevailing Direction, Southwest, 



Summary. 



South, 23 per cent. 



West, 16 " " 



Northeast, 13 " " 



South Southeast, 13 " " 



North, 10 " 



Southwest, 10 " " 



Other directions 15 " " 



tVeather. 

 Mean cloudiness observed, .... 67 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 269 hrs.=63 per cent. 



Number of clear days, 5 



Number of fair days, 8 



Number of cloudy days, 18 



Briyht Stinshine. 

 Number of hours recorded, . . . 160 hrs.=37)( 

 jBain, 3d, 4th, 6th, 7th, Sth, gth, loth, nth, 

 13th, 15th, 17th, iSth, 19th, 20th, 22d, 23d 

 24tb, 27th. 

 Oalea, 35 miles or more per hour, none. 

 Thunder and Lightning, 10th, 15th, 20th, 

 24th. 



