METEOROLOGICAL OBSERVATORY 



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, 2yj._$ ft. 

 Height of Wind lustnimcnts 72 ft. 



BULLETIN No. 164. 



AUGUST. 1902. 



MONTHLY SUMMARY. 



Weaaure. In inches. 



Maximum reduced to freezing, 28.97, zgtli, 7 A. 

 Minimum reduced to freezing, 29.30, 6th, 12 p- 

 Keducedt maximum reading, 30.26, 2gth, 7 A. 

 Iveducedf minimum reading, 29.59, 6th, 12 p. 



.Mean tri-daily reduced, 29.920 



Monthly range • 67 



*Air Temperature. In Degrees Fahr. 



Highest, 87.0, 4th, 4 p. 



Lowest, 430. 13th, 6 A. 



Mean liourly, 66.1 



Mean of means of max. and min., .... 66.2 



Mean sensible (wet bulb), 57.7 



Monthly range, 44-0 



Higliest mean daily, 74.0, 2d 



Lowest mean daily 58.4, iSth 



Mean maximum, 78.3 



Mean minimum, 54-1 



Mean daily range, 24.2 



Greatest daily range, 35-5i 20th 



Least daily range, i3-o. 6th 



Iliitnidit!/. 



Mean dew point, 57-8 



.Mean force of vapor 662 



Mean relative luimidity, 76.3 



Precipitation. In inches. 



Total precipitation, 4-'^5 



Number of days on which .01 incir or more 

 rain or melted snow fell, 10 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 23S6m. 



Greatest daiJy movement, . . . . 151m., ist. 



Least daily movement, 9m., 27th. 



Mean daily movement, 77.0 ni. 



Mean hourly velocity, 3.2 m. 



Maxinuim pressure per square foot, S.o lbs.= 



40 m. per hour, nth, 7 p., W.S.W. 

 Prevailing Direction, North. 

 Summary. 



West, Southwest, 19 per cent. 



East, Northeast 16 " " 



West, 13 " " 



North 10 " " 



East, 10 " " 



Other directions 32 " " 



Weather. 



Mean cloudiness observed, . . . . 50 per cent. 

 Tot;il cloudiness recorded by tlie Sun Ther- 

 mometer, 220 hrs.=5i per cent. 



Nuniter of clear days, 7 



Number of fair days, 14 



Number of cloudy days, 10 



liright Sunshine. 



Number of hours recorded, . . . 209 i)rs.=49lt 

 JKfflin, ist, 4tii, 6th, 8th, 10th, nth, iSth, 19th, 



2TSt, 22d, 23d, 25th, 27th, 29tll. 



Thunder and Lightning, 2d, 3d, 4th, Stii. 



27th, 28th, 29th. 

 Galea, 35 miles or more per hour, 40m., 



nth, W.S.W. 



