BULLETIN No- 295. 



JULY, 1913 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 31 ft. Above sea level, 2'/j.^ ft. 

 Height of Wind Instrntnents 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 29 90. 31st, 12 P 

 Minimum reduced to freezing. 29.26, 6th, 2 p. 

 Reduced! maximum reading, 30.19,31st, 12 p. 

 Reducedt minimum reading, 29.54, 6th, 2 p 



Mean semi-daily reduced, 29.941 



Monthly range, 0.65 



•Air Temperature. In Degrees Fahr. 



Highest, loo.o, ist, 3P. 



Lowest, 410. 12th, 5:30 A 



Mean iiourly, 71.4 



Mean of means of max. and min., .... 71.6 



Mean sensible (wet bulb), 63.5 



Monthly range 59 o 



Highest mean daily 81.8, ist 



Lowest mean daily 61.8,7th 



Mean maximum, 85.4 



Mean minimum, 57-7 



Mean daily range 27.7 



Greatest daily range, 45-°. 12th 



Least daily range, 10.5,24th 



Humidity. 



Mean dew point, 59,8 



Mean force of vapor, 754 



Mean relative humidity, 70.5 



Precipitation. In inches. 



Total precipitation, 1.59 



Number of days on which .01 inch or more 



rain fell, • 9 



* Temperature in ground shelter. 

 tKeduced to freezing and sea-level. 



Wind. 



Total movement, 43ism. 



Greatest daily movement, .... 324m., loth 



Least daily movement 46m., 20th 



Mean daily movement 139 m 



Mean hourly velocity, 5.8 m 



Maximum pressure per square foot, 2.7 Ibs.^ 



73m. per hour, 23d, 5 P., S.S.W. 

 Maximum velocity for 5 minutes, 27m. per 



hour, 23d, 4P., S.S.W. 

 Prevailing Direction, Southwest. 



Summary. 



South 29 per cent. 



Northwest 13 " " 



North Northwest 10 " " 



South Southwest . . , 10 " " 



South Southeast 10 " " 



Other directions 28 " " 



Weather. 



Mean cloudiness observed, . . . .39 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i38hrs.=3o per cent. 



Number of clear days, n 



Number of fair days, 17 



Number of cloudy days, 3 



Bright Sunshine. 



Number of hours recorded, . . 324 hrs=7oj(. 



Bain, 2d, 8th, loth, 12th, 13th, i8th, 20th, 21st, 



23d, 24th, 2Sth, 29th. 



Thunder and L,igljtning, 8th, 13th, iSth, 



2ist, 23d, 2Sth, 29th, 30th. 



Gales, 35 or more miles per hour : 73m, 23d, 



S.S.W. 



