BULLETIN No. 33 1. 



JULY, 19 16 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



ffeii^ht of barometer above ground, 51 ft. Above sea level, 2-jj.^ ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, 30.06, 15th, 9 A 

 Minimum reduced to freezing, 29.22, 3d, 3 p 

 Reducedt maximum reading, 30.35, 15th, 9 a 

 Reducedt minimum reading, 29.51, 3d, 3 v 



Mean semi-daily reduced 29.984 



Montlily range 0.84 



*Air Temperature. In Degrees Fahr. 



Highest 935,31st, 2P 



Lowest 46-5> ist, 4oO A 



Mean hourly 716 



Mean of means of max. and min 72.5 



Mean sensible (wet bulb) 67.6 



Monthly range 47 o 



Highest mean daily 78.8, 12th 



Lowest mean daily , . . .61.4 4th 



Mean maximum S2.9 



Mean minimum 62.4 



Mean daily range 20.5 



Greatest daily range 39-5, ist 



Least daily range 7-5, 26th 



Humidity. 



Mean dew point 61 .g 



Mean force of vapor ... .- 0.780 



Mean relative humidity 81.8 



Precipitation. In inches. 



Total precipitation 6.85 



Number of days on which .01 inch or more 

 rain fell 16 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3126 m 



Greatest daily movement . . 185m, i6th, 21st 



Least daily movement 3Sm, 24th 



Mean daily movement loi m 



Mean hourly velocity 4.2 m 



Maximum pressure per square foot, 9.0 lbs = 



42m per hour, 8th, 3 ?, N.N.W. 

 Maximum velocity for 5 minutes, 20m per 



hour, 31st, 8 p, N. 

 Prevailing direction. South Southwest. 



Summary. 



South Southwest 16 per cent 



South 39 " " 



Other directions 45 " " 



Weather. 



Mean cloudiness observed .... 57 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 278 hours = 60 per cent 



Number of clear days i 



Number of fair days 18 



Number of cloudy days 12 



Bright Sunshine. 



Number hours recorded, 184 hrs, == 40 per cent 

 Rain. 2d, 3d, 4th, 8th, 9th, loth, 13th, 17th, 



20th, 2ISt, 22d, 23d, 25th, 26th, 27th, 2Sth, 

 3TSt. 



Thunder and Liahtnin^. 2d, 9th, 17th, 



2ISt, 22d, 31st. 



Gales. 35 or more miles per hour. 42m, 8t!i, 

 N.N.W.; 36m, 27th, N.N.E. 



