METEOROLOGICAL OBSERVATORY 



llatcli Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of Ihxrometer above ground, ST ft. Above sea level, 2yj.s ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 140. 



AUGUST, 1900. 



MONTHLY SUMMARY. 



I'ressufe, \n inches. 



Maximum reduced to freezing, 29.96, 31st, 12 p. 

 Minimum reduced to freezing, 29.44, nth, 5 P- 

 Keducedl maxinuim reading, 30.25, 31st, 12 i'. 

 Reducedt minimum reading, 29.72, nth, 5 p. 



Mean tri-daily reduced, 29.9S8 



Montiily range • 53 



*Air Teiniieratiire. In Degrees Fahr. 



Highest 96.0, 6th, 5-30 P. 



I.owest, 43-0. 4tli. 5 a. 



Mean hourly, "o-i 



Mean of means of max. and min 70.6 



Mi^an sensible (wet bulb), 65.2 



Monthly range 53-0 



lligiiest mean daily, 82. S, nth 



Lowest mean daily, 61.0, 4th 



Mean maxinuim, S2.6 



Mean mininuim 58.6 



Mean daily range 24.0 



Greatest daily range 37.0, 5th 



Least daily range, 6.0, 15th 



Hmuiditij. 



Mean dew point 62.0 



Mean force of vapor 781 



Mean relative humidity, . . . • ... .75.9 



I'recipifiition. In inches. 



Total precipitation, . • 4. 



Numljer of days on which .01 inch or more 

 rain or melted snow fell, 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 2322m. 



Greatest daily movement 174 ni., 15th 



Least daily movement 13111., 26th 



Mean daily movement, 75 "'• 



Mean hourly velocity, 3-1 m. 



Maximum pressure per square foot, i6.o Ibs.^ 



57 m. per hour, 6th, 9 p., N.N.W. 

 Prevailing Direction, Southeast. 



Summary. 



Southeast, 32 per cent. 



North, 13 " 



.South, Southeast, 10 " " 



South, 10 " " 



Northwest, 10 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed, . .'. . 40 ])er cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 203 hrs. =47 per cent. 



Xumter of clear days, 7 



Number of fair days, 15 



Number of cloudy days, 9 



Urijflit Sinishine, 



Number of hours recorded, . . .226hrs. = 53< 

 Haul, 2d, 6th, 7th, Sth, loth, I3tli, 14th, i5th^ 



i6th, I7tii, 19th. 24th, 26th. 27th, 2,Sth. 

 Tliundrr and l.iyhtnlng, 6th, loth, i;th, 



16th. 17th, 26th, 27th. 

 Oali-a, 35 miles or more per hour, 57m., 6th, 



N. N. W. 



