METEOROLOGICAL OBSERVATORY 



OK THK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 31 ft. Above sea level, s-jj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 176. 



AUGUST. I903. 



MONTHLY SUMMARY. 



Pressure, In inches. 

 Maximum reduced to freezing. 30.13, 2d,S A. 

 Mininumi reduced to freezing, 29,37, 20th, 3 p. 



22d. 4 r. 

 Reducedf maximum reading, 30.42, 2d, Sa 

 Keducedt minimum reading, 29.65, 20th, 3 p., 



22d, 4 P. 



Mean tri-daily reduced 29.99; 



Monthly range • 7; 



*Alr Tetnpemtiire, In Degrees Fahr. 



Highest 84.5. 22d, 2 p 



Lowest 42.5, Sth, 5:30 A 



Mean hourly, 62.0 



Mean of means of max. and min., .... 62.4 



.Mean sensible (wet bulb) .- • 5^. 1 



Montiily range 42.0 



Highest mean daily 72.5, 22d 



Lowestniean daily, 55.0, 29th 



Mean maximum, 73.2 



Mean minimum, 51.5; 



Mean daily range 21.; 



Greatest daily range, 35.5, 14th, ifith 



Least daily range, 4.5, 5th 



Ifiitnitlity. 



Mean dew point, 54.7 



Mean force of vapor, 593 



Mean relative humidity, 7S.2 



freeljtittition. In incites. 



Total precipitation, 4.92 



Numlx;r of days on which .01 incli or more 



rain or melted snow fell 12 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 2105 m. 



Greatest daily movement, .... 194m., iqth. 



Least daily movement 4m., 27th. 



Mean daily movement 6Sm. 



Mean hourly velocity, 2.8 m. 



Maximum pressure per square foot, 3.0 lbs.= 



24 m. per hour, 23d, i p., W. 

 Prevailing Direction, West. 

 Summary. 



South Southeast, 16 per cent.. 



Northwest 13 " " 



North, ID " " 



West 13 " " 



West Southwest, 13 " " 



South, 13 " " 



Other directions, 22 " " 



Weather. 



Mean cloudiness observed, .... 63 per cent. 



Total cloudiness recorded by the Sun 'i'her- 



mometer, . ... 260 hrs.=6i per cent. 



Numlxir of clear days, 7 



Numter of fair days, 9 



Numter of cloudy days, 14 



Bright StinsIUne, 



Numljer of hours recorded, . . . 169 lirs.=39< 

 K«;u, 3d, 4th, 5th, 6th, 7th, 9th, nth, i6th, 



19th, 20th, 25th, 2Sth. 29th, 30th, 31st. 

 allien, 35 miles or more per hour, none. 

 Thunder and Lightning, 25th. 



