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BULLETIN No. 463. 



^_^_^^tU_u It 1 1 r a \ 

 JULY, LQl^^^t 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Hei'i^ht of barometer above ground, 51 ft. Above sea level, 2jj.^ ft. 

 Height oj IVitiil Instruments 72 ft. 2'ime used, y^thMer. 



MONTHLY SUMMARY. 



PressuTe. In inches. 



Maximum reduced to freezing, 30.01, 21st, 11 A. 

 Minimum reduced to freezing, 29.45, 24th, 5 p. 



29tli, 3 P. 

 Reduced maximum reading. 30.30, 21st, 11 a. 

 Reduced minimum reading, 29.73, Z4th, 5 p. 



29th, 3 p. 



Mean semi-daily reduced 29.969 



Monthly range 0.57 



Air Temperature. 



In Degrees Fahr. 



Highest 91.0, 13th, 2-30 P. 



Lowest 43.5, 5th, 6 A. 



Mean hourly 69 6 



Mean of means of max. and min 70.6 



Mean sensible (wet bulb) 67.2 



Monthly range 47.5 



Highest mean daily 78.3, 14th 



Lowest mean daily 60.0, 5th 



Mean maximum So. 4 



Mean minimum 60.S 



Mean daily range ig.6 



Greatest daily range 33.0, 9th 



Least daily range 6.0, 23d 



Humidity. 



Mean dew point 65.9 



Mean force of vapor 726 



Mean relative humidity 88. 8 



Precipitation. In inches. 



Total precipitation, in inches 3 40 



Number of days on which .01 inch or more 

 rain fell 14 



Wind. 



Total movement 3426m 



Greatest daily movement i77iT>, 4th 



Least daily movement 36m, 26th 



Mean daily movement 112m 



Mean hourly velocity 4.7m 



Maximum pressure per square foot. lo.o lbs = 



44m per hour, 13th, 4 p. S.S.W. 

 Maximum velocity for 5 minutes, 27m per 



hour, 13th, 4 p., S.S.W. 

 Prevailing direction. South Southwest 



Summary. 



South 39 per cent 



Southwest 16 " " 



South Southwest 13 " " 



Other directions 32 " " 



Weather. 



Mean cloudiness observed .... 60 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 256 hours = 55 per cent 



Number of clear days 3 



Number of fair days 22 



Number of cloudy days 6 



Briiiht Sunshine. 



Number hours recorded, 206 = 45 per cent. 

 Rain. 3d 6th, 7th, loth, 12th, 13th. 14th, 15th, 



i6th,i7th, iSth, 20th. 23d, 27th, 29th, 31st. 

 Thunder and LiiihtninA, 7th, I2th, 13th, 



14th, 15th, i6th, 20th, 27th, 29th. 

 Galea. 44m, 13th, S.S.W. 



