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METEOROLOGICAL OBSERVATORY 



OF THK 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



.A-IVEiEiEIiST. 



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



Height of barometer above ground, 51 ft- Above sea levels 273-5 ft- 

 Height of Wifid Iiistrtimetits 72 ft. 



BULLETIN No. 2 10. 



JUNE, 1906. 



MONTHLY SUMMARY. 



Freasure. In inches. 



Maximum reduced to freezing, 30.06, i3tli, 8 a. 

 Minimum reduced to freezing, 29.30, loth, 3P. 

 Reducedl ma.ximum reading, 30.35, 13th, 8 A. 

 Reduced! minimum reading, 29.58, loth, 3 p. 



Mean semi-daily reduced, 29.935 



Montlily range 0.77 



*Air Temperature. In Degrees Fahr. 



Highest 87.5. 28th, 3 P. 



Lowest, 37.0, 12th, 5:30 A. 



Mean hourly, 66.1 



Mean uf means of max. and min., .... 66.1 



Mean sensible (wet bulb), 61.3 



Monthly range 5o-5 



Highest mean daily 74.8,29th 



Lowest mean daily 55-2, 12th 



Mean maximum 78.1 



Mean minimum, 54-2 



Mean daily range 23.9 



Greatest daily range, 38. 5, 14th 



Least daily range 6.5, 17th, i8th 



HutHidltt/, 



Mean dew point, 58.3 



Mean force of vapor 64.0 



Mean relative humidity, 79.1 



Precipitation. In inches. 



Total precipitation 2.82 



Number of days on which .01 inch or more 

 rain or melted snow fell . .11 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 1409 m. 



Greatest daily movement, .... 121 m., nth 



Least daily movement, 3 ni., i6th 



Mean daily movement 47 ni. 



Mean hourly velocity, 2 m. 



Maxinuim pressure per square foot, 5.0 lhs.= 



32 m. per hour, 6th, 4 p., N.W. ; 30th, 3 p., 



N.N.E. 



Maximum velocity for 5 minutes, 20 m. per 

 hour 30th, 3 P., N.N.E. 



Prevailing Direction, West, Northwest. 



Summary. 



South, Southeast, 17 percent. 



South 10 " " 



Northwest, 23 " " 



Other directions, 50 " " 



Weather. 



Mean cloudiness observed, .... 54 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . 141 hrs.=3T per cent. 



Number of clear days, 11 



Number of fair days, 16 



Number of cloudy days 3 



Ttright Sun/ihine. 



Number of hours recorded, . . 316 hrs.=69i< 



iJafii, 2d,5th, 6th, 8th, 9th, loth, i6th, 17th, 



iSth, 23d, 29th, 30th. 

 Oales, 35 miles or more per hour, none. 

 Thunder and Lightning. 5th, 6th, 9th, 



loth, 15th, 22d, 23d, 28th. 



