METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 31 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 198. 



JUNE, 1905. 



MONTHLY SUMMARY. 



I'resaure. In inches. 



Maximum reduced to freezing, 29.90, gtli, 8 A, 



5th, S A. 

 Minimum reduced to freezing, 29.0S, 26tli, i i'. 

 Keducedt maximum reading, 30.19, 9tii, 8 a. 

 Keducedt minimum reading, 29.36, 26th, i p. 



Mean semi-daily reduced, 29.933 



Monthly range, 0.83 



*Air Temperature. In Degrees Fahr. 



Highest, 90.0, 15th, 3 p. 



Lowest 36.0,9th, 5:30 A. 



Mean hourly, 64.4 



Mean of means of ma.\. and min., .... 64.3 



Mean sensible (wet bulb), ;9-3 



Monthly range, 54-0 



Highest mean daily 77.6, iSth 



Lowest mean daily, So-Si 8th 



Mean maximum, 76.4 



Mean minimum, 52.1 



Mean daily range, 24.3 



Greatest daily range, 45.0, 9th 



Least daily range, 3.0, 12th 



Humidity. 



Mean dew point, 56.5 



Mean force of vapor, 602 



Mean relative humidity, 78. 8 



Precipitation. In inches. 



Total precipitation, 2.86 



Number of days on which .01 inch or more 

 rain or melted snow fell, 12 



• Temperature in ground shelter. 

 Reduced to freezing and sea-level. 



Wind. 



Total movement, 3108 ni. 



Greatest daily movement, .... 236 m., 8th 



Least daily movement 1 ni., 22d 



Mean daily movement .103111. 



Mean hourly velocity, 4.3in. 



Maximum pressure per square foot, 6.0 lbs.= 



35 m. per hour, 26th, 2 p., W.N.W. 

 Prevailing Direction, West Northwest. 



Summary. 



South, Southwest, 17 per cent. 



North, 10 



Northeast 10 



West, .Southwest 10 



Southwest, 10 



Other directions, 43 



Weather. 



Mean cloudiness observed, . . . . 61 per cent. 

 Total cloudiness recorded by the Sun 'J'her- 



mometer, 2iohrs.=46 per cent. 



Number of clear days, 8 



Number of fair days, 14 



Number of cloudy days, 8 



Bright 8un»hine. 



Number of hours recorded, . . . 247 hrs. = 54# 

 Kain, 2d, 4th, 6th, 7th, 8th, nth. 12th, 13th, 



18th, 19th, 20tll, 2ISt, 22d, 23d, 26tll, 27th. 



Gales, 35 'miles or more per hour, 35 m. 26th, 

 W.N.W. 



Thunder and Lightninat 2d, 5tl), 

 17th, i8th. 



13th, 



