BULLETIN No. 318. 



JUNE. 1915 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



ffei,^ht of Ihiroineter abo7<e ground, 31 ft. Above sea level, ^jj.^ ft. 

 Height oj IViful Instrntnetits f2 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 29 94, 5th, 9 p. 



28th, 8 a. 

 Minimum reduced to freezing, 29.30, 23d, 3 A. 

 Reducedf maximum reading, 30.23, 5th, 9 p. 



28th S A. 

 Reducedt minimum reading, 29.60, 23d, 3 A. 



Mean semi-daily reduced, 30.020 



Montlily range, 0.64 



•Air Temperature. In Degrees Fahr. 



Highest 89.0, 14th, 3.30 P. 



Lowest 37.0, 4th, 5 A. 



Mean hourly, 64.2 



Mean of means of max. and min 64.5 



Mean sensible (wet bulb), 57 7 



Monthly range, 52.0 



Highest mean daily, . 72-°. 14th 



Lowest mean daily 55.5i 2d 



Mean maximum, 76.9 



.Mean minimum, 52.1 



Mean daily range, 24-8 



Greatest daily range, 40.0, ist 



Least daily range, 7-5i i5th 



Humidity. 



Mean dew point, . . . . 

 Mean force of vapor, . 

 Mean relative humidity. 



53-4 

 • 593 

 71.4 



Precipitation. In inches. 



Total precipitation 3-00 



Number of days on which .01 inch or more 

 rain fell 



•Temperature in ground shelter. 



1 deduced to freezing and sea-level. 



Wind. 



Total movement, 2439m. 



Greatest daily movement, .... 225ni., 12th 



Least daily movement 48m., ist 



Mean daily movement, 114 ni. 



Mean liourly velocity, 4. 8m. 



iVlHxiuium pressure per square foot, 19.5 lbs. = 



62m. per hour, 19th, 2P., S.S.W. 

 Maximum velocity for 5 minutes, 24ni. per 



hour, nth, 5P., S. S.W. 

 Prevailing Direction, South Southeast. 



Summary. 



North Northeast 13 per ce 



South .Southwest i7 



East 13 " 



East Northeast 10 " 



Southwest 13 



West Northwest ic 



Other directions 24 



Weather. 



Mean cloudiness observed, . . . 41 per cent. 



'Total cloudiness recorded by the Sun 'Ther- 



m ) neter, .... 1S8 hrs. = 42 per cent. 



Numljer of clear days, 8 



Number of fair days, 18 



Number of cloudy days 4 



Briglit Sunsliine. 



Number of hours recorded, . . 269 hrs. =5854. 

 Kaiii, 7st, 8th, 15th, 17th, 19th, 20th, 23d, 

 26th, 27th, 30th. 

 Thunder and Lightning, i5st, 17th, 2o;h, 



26th; 

 Oales, 35 or more miles per hour : 36m., loth, 



N.; 40m., nth, S.S.W.; 62m,, 19th, S.S.W. 



