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, 2YJ.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 175. JULY, 1903. 



MONTHLY SUMMARY. 



fresstire. In inches. 

 M.ixiimim reduced to freezing, 29.8S, 5th, 8 A. 

 Mininium reduced to freezing, 29.31, igth, 6 A 

 Keducedt maximum reading, 30.17, 5th, 8 A 

 Keducedf minimum reading, 29.60, 19th, 6 A 



Mean tri-daily reduced, 29.S77 



Monthly range • 57 



*Air Tcinperatttre. In Degrees Fahr. 



Highest 97.0, 9th, 4 r. 



Lowest, 44.5, 28th, 6 A. 



Mean hourly, 68. g 



Mean of means of max. and min., .... 69.3 



Mean sensible (wet l)ull)), 63.6 



Monthly range, 52.5 



Highest mean daily, 79.6, 9th 



Lowestmean daily 59.6, 15th 



Mean maximum, S1.3 



Mean minimum, 57.3 



Mean daily range, 24.0 



Greatest daily range, 37.0, 25th 



l^east daily range, 11.5,21st 



Hutnidlttj. 



Mean dew point, 59-3 



Mean force of vapor 77S 



Mean relative humidity, '. ...... .71.4 



I'i'erij>itation. In inches. 



Total precipitation, 4-64 



Number of days on which .01 inch or more 



rain or melted snow fell, i 



♦ Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3087m. 



Greatest daily movement, . . . . 261m., 2d. 



Least daily movement 19m., 13th. 



Mean daily movement, looni. 



Mean hourly velocity, 4.2ni. 



Maximum pressure per square foot, 15.5 lhs.= 



56 m. per hour, 29th, 7:30 p., S.W. 

 Prevailing Direction, Southwest. 

 Summary. 



South Southeast, 26 per cent. 



West, Northwest 13" " 



North, Northwest, 16 " " 



Southwest, . 10 " " 



.South, 10 " " 



Other directions, 25 " " 



}ycather. 



Mean cloudiness observed, . . - . 52 jier cent. 

 Total cloudiness recorded by tiie Sun Ther- 

 mometer, 215 lirs.=47 per cent. 



Number of clear days, 10 



Number of fair days, 12 



Number of cloudy days, 9 



liright Sunshine. 

 Number of hours recorded, . . . 247 hrs. = 53;< 

 Rain, ist, 5th, 6th, 10th, 12th, 13th, 14th, 15th, 



16th, 18th, 19th, 20th, 2ISt, 22d. 29th, 30th. 



Galea, 35 miles or more per hour, 39m. 2d, 



W.S.W. ; 56m. 29th, S.W. 

 Thunder and Liyhtning, 10th, 12th, 14th, 



20th, 2lSt, 22d, 25th, 29th. 



