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, 5/7?. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 174. JUNE. 1903^ 



MONTHLY SUMMARY. 



PretBitre. In inches. 

 Maximum reduced to freezing, 30.09. 5th, 7 A. 

 Minimum reduced to freezing, 29.13, 12th, 12 M- 

 Reducedt maximum reading, 30.39, 5th, 7 A- 

 Reduced* minimum reading, 29.42, 12th, 12 m' 



Mean tri-daily reduced, 29.941 



Monthly range • 97 



*Air Temperature. In Degrees Fahr. 



Highest, 86.5, 3rd, 3 p. 



Lowest, 38.0,6th, 530 A. 



Mean hourly, 59-6 



Mean of means of max. and min 60.3 



Mean sensible (wet bulb), 56.8 



Monthly range 48.5 



Highest mean daily, 70.5, loth 



Lowestmean daily 52.5, 5th 



Mean maximum, 69.8 



Mean minimum, 50.7 



Mean daily range 19.1 



Greatest daily range, 42.0, 3rd 



Least daily range, 3.5,15th 



Humidity. 



Mean dew point, 53-7 



Mean force of vapor, 550 



Mean relative humidity, 81. i 



Precipitation. In inches. 



Total precipitation, 7-79 



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, 3i3oni. 



Greatest daily movement, .... 279m., 12th. 



Least daily movement, 27m., 5th. 



Mean daily movement, 104m. 



Mean hourly velocity, 4.3ni. 



Maximum pressure per square foot, 9.0 Ibs.= 



43 m. per hour, 12th, 4 P., S.S.E. 

 Prevailing Direction, Southeast. 



Summary. 



South Southeast, 17 per cent. 



Southeast, 13 " " 



Southwest, 10 " " 



West 10 " " 



Other directions 50 " " 



Weather. 



Mean cloudiness observed, .... 71 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 355 hrs.=78 per cent. 



Number of clear days, 4 



Number of fair days, 4 



Number of cloudy days, 22 



Bright Sunehine. 

 Number of hours recorded, . . . 102 hrs.=22* 

 Rain, 7th, 8th, 9th. loth, nth, 12th, 13th, 14th, 



15th, 18th, 19th, 20th, 2ISt, 22d, 23d, 24th, 

 25th' 29th, 30th. 



Salet, 35 miles or more per hour, 43m. 12th, 



S.S.E. 

 Thunder and Lightning, loth, nth, 29th. 



