METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 48.5" N. Longitude 72° 31' 10" \V. 



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

 Height of Wind Instruments 72 ft. 



BULLETIN No. 150. 



JUNE. 1901 



MONTHLY SUMMARY. 



Preaanre. In inches. 

 Maximum reduced to freezing, 29.95, i3t'i. 7^- 

 Minimum reduced to freezing, 29.35, 23d, 3 p' 

 Reducedt maximum reading, 30.24, 13th, 7 A. 

 Reduced! minimum reading, 29.63, 23d, 3 p 



Mean tri-daily reduced, 29.952 



Montlily range ■ 61 



*Air Tetnperature. In Degrees Falir. 



Highest 98.5, 2Sth, 3 P. 



Lowest, 410, i6th, 5 A. 



Mean hourly, 68.0 



Mean of means of max. and min., .... 66.7 



Mean sensible (wet bulb), 61.4 



Montlily range 57-5 



Highest mean daily, 82.9,28th 



Lowest mean daily, 53-5. 'st 



Mean maximum, 80.1 



Mean minimum, 54-4 



Mean daily range, 25.7 



Greatest daily range, 39.5, 12th 



Least daily range, 9.5, 15th 



Biitnidity. 



Mean dew point, 56.2 



Mean force of vapor, 755 



Mean relative humidity, ........ .65.5 



Precipitation. In inches. 



Total precipitation, . • 0.87 



Number of days on which .01 inch or more 

 rain or melted snow fell 5 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3647m. 



Greatest daily movement, 264 m., 9th 



Least daily movement, . . . 36 m., 12th, 26th 



Mean daily movement, 121.6 m. 



Mean hourly velocity, 5.1m- 



Maximum pressure per square foot, 7.5 lbs.= 

 39 m.per hour,8th,4 p.,W.; 9th 3P.,N.N.\V. 

 Prevailing Direction, South Southwest. 



Summary. 



South, 42 per cent. 



Southwest, 15 " " 



West, 13 " " 



Other directions, 30 " " 



WeatJier. 



Mean cloudiness observed, .... 48 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 203 hrs.=44 per cent. 



Number of clear days, 11 



Number of fair days, 9 



Number of cloudy days, 10 



Bright Sunshine. 



Number of hours recorded, . . . 254 hrs. = 56H 

 Rain, 2d, 6th, 7th, 14th, 20th, 21st, 22d, 23d, 

 29th. 



Qales, 35 miles or more per Hour, 37m., 7th, 

 S.; 39 m., 8th, W.; 39m.,9th, N.N.W. 



Thunder and Lightning, 4th, 6th, 22d, 

 23rd, 29th. 



