METEOROLOGICAL OBSERVATORY 



OK THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground, 51 ft. Above sea level, 260 ft. 



BULLETIN No. 91. 



JULY, 1896. 



MONTHLY SUMMARY. 



Pressure. In inches. | 



Actu.al maximum reading, . . 30.21, 7 a., lOtli 



Actual min. reading 29.43, 15tli G P.j 



Reduccil maximum reading, 30.49, 7 a., 19th 

 Reduceci min. reading, . . . . 29.70, IStli 6 p. 



Mean reduced to sea level, 30.094 



Monthly range 0.7sl 



*Air Temperature. In Degrees Fahr. 



Highest 91.0; 29th 



Lowest 50.0; 17th 



Mean, 70.7 



Mean of means of max. and min., .... 71. 3 



Mean sensible(wet bulb), G0.2 



Monthly Range 41.0 



Highest mean daily 78.0, 10th 



Lowest mean daily, 59.4, 24th 



Mean maximum, 81. 5 



Mean minimum, 61.1 



Mean daily range, 20.4 



Greatest daily range, 31.0; 1st, ISth 



Least daily range, .10.0,4th 



WuMiiditj/. 



Mean dew point, 62.4 



Mean force of vapor, 0.828 



Mean relative humidity, 73.4 



irt»irf. 



Prevailing Direction, south. 

 Summary. 



•South 2C per cent. 



Southwest, 10 " " 



Southeast 10 " " 



South South West, 2(; " " 



Other directions, 2S " " 



Total movement 4048 m. 



Greatest daily movement, . . . 256 m., 20tli 



Least daily movement, 38 m., 14th 



Mean daily movement, 130.6 m. 



Mean hourly velocity, . 5.4 m. 



Maximum pressure per square foot, 8.5 lbs. 

 =41 m. per hour, 3d, 1 P. 



Precipitation. In inches. 



Total precipitation 4.96 



Number of days on which .01 inch or more 

 rain fell, 12 



Weather. 



Mean cloudiness observed, ... 50 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . .202 hours or 44 per cent. 



Number of clear days, . . . : 10 



Number of fair days, 10 



Number of cloudy days 11 



Bright Sunahine. 



Number of Hours recordeil, 260 hours or 56* 



Rain, 3d, 4th, ,^th, 6th, 7th, 8lh, 9th, 13th, 14th, 



15th, 16th, 20th, 21st, 23d, 24th, 25th, 27th, 



2Sth, 30th. 

 Gales, ot 35 or more miles per hour, 41 m., 



•M, K.; 36 m.,llth, VV.N.W. ; .35m., 31st, N. 



Thunder and Lightning, 3d, 7tli, 15th ,30th. 

 Solar Ualo, 29th. 



Temperature in ground shelter. 



