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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 lei'el, 2yj.3 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 126. 



JUNE, 1899. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 2g.g6, 23d, 7 a. 

 Minimum reduced to freezing, 29.3S, 2otli, 4 p. 

 Reducedt maximum reading, . 30.25, 23d, 7 A. 

 Reducedt minimum reading, 29.66, 20th, 4 p- 



Mean tri-daily reduced, 29.9S3 



Monthly range, . . . . • 59 



*Air Temperature. In Degrees Fahr. 



Higliest, 93.0, 5th, 3 p. 



Lowest, 42., iitli, 6 A. 



Mean hourly, 67.4 



Mean of means of max. and min., . . . .67.8 



Mean sensible (wet bulb), 61.2 



Monthly range, 51.0 



Highest mean daily 81.5,6th 



Lowest mean daily, 61.2, i6tii 



Mean maximum, 80.6 



Mean minimum, 55.1 



Mean daily range, 25.5 



Greatest daily range, 37.0, 2otli 



Least daily range, 7.0, 25th 



Bumidit!/. 



Mean dew point, 59.5 



Mean force of vapor, 741 



Mean relative humidity, . . . • .... 74.0 



PreclpiUition. In inches. 



Total precipitation, . • 4.13 



NumlDcr of days on which .01 inch or more 

 rain or melted snow fell, 8 



Wind. 



Total movement, 3S14 m. 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Greatest daily movement, . . . 265 m., 23d 

 Least daily movement, . . . . 59 m., igtli, 26th 



Mean daily movement, 127. m. 



Mean hourly velocity, 5.3 



Maximum pressure per square foot, 7.5 lbs.= 



39 m. per hour, on 6th, 4.00 p., N. W. 

 Prevailing Direction, West Southwest. 



Summary. 



Southwest, 17 per cent. 



South southwest, . 13 " " 



South, 13 " " 



North 27 " " 



Other directions, 3° " " 



IVenther. 



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

 Total cloudiness recorded by the Sun Ther- 

 mometer, 222 hrs. =49 per cent. 



Number of clear days, 3 



Number of fair days, 21 



Number of cloudy days, 6 



Sright Sunshine. 



Number of hours recorded, . . . 235 hrs.=5H( 



Rain, ist, 9th, 14th, 15th, 20th, 23d, 24th, 25th, 

 28th, 29th. 



Thunder and Uightning, ist, 15th, 23d, 



24th, 25th. 

 Aurora, 29th. 

 Oales, 35 miles or more per hour, 39 m., 6th, 



N.W. ; 36 m., 20th, S.W. ; 35 m., 23d' 



S.W.; 35 m., 30th, N. 



