METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



BULLETIN No- 90. 



JUNE, 1896. 



MONTHLY SUMiVlARY- 



I'reaimre. In inches. 

 Actual maximum reading, . 30.i4, 8 a., 25th 

 Actual min. rca(ling,-29.31, loth 5 P., 11th, 4 P. 

 Reduced maximum reading, 30.42, 8 A., 2otli 

 Reduced min. reading,2i).59,10th 5 p. ,11th 4 P. 



Mean reduced to sea level, 30.047 



Monthly range, 0.83 



*Air Temperature, In Degrees Fahr. 



Highest, 91.0; 90.0,21st 



Lowest, 41., nth; .39., 3d 



fMean, 6.5.0. 



Monthly Range 50.0; 51.0 



t Highest mean daily 77.9, 20th 



fLowest mean daily 52.fi, 14th 



Mean maximum 77.2; 7G.0 



Mean minimum 53.9; .52.1 



Mean daily range, 23.3; 23.9 



Greatest daily range,. . . . 40., .5th; 40.5; 3d 



Least daily range 5.0; 4.0,14th 



Uumidlty. 



Mean dew point 53.9 



Mean force of vapor 0.677 



Mean relative humiilitj' . . 67.3 



Wind. 



Prevailing Direction, southwest. 



Summary. 



South, 20 per cent 



North, 10 " " 



West 10 " " 



South South West, 23 " " 



Other directions 37 " " 



Total movement 3926 m. 



Greatest daily movement, . . .264 m., 14th 



Least daily movement 63 m., 3d 



Mean daily movement, 130.9 m. 



Mean hourly velocity 5.5 m. 



Maximum pressure per square foot, 7.75 lbs. 

 =39 m. per hour, 11th, 10 A. 



Precipitation. In inches. 



Total precipitation 2.57 



Number of days on which .01 inch or more 

 rain fell, 6. 



Weather. 



Mean cloudiness observed, ... 47 per cent. 



Total cloudiness recorded by the Sun Tlier- 



mometer, . . . 194 hours or 42 per cent. 



Number of clear days, 12 



Number of fair days 8 



Number of cloudy days, 10 



Bright Sunshine. 



Number of Hours recorded, 236 hours or 58* 

 Ka»n, 7th, 8th, 9th, lOtli, UUi, IGtli, 17th, 20th, 



21st, 25th, 26th, 2Sth. 

 Gales, <)f35 or more miles per hour, 36, 10th» 



N.N.E.; 39, nth, N.W.; 37, 21st, S.W; 37, 



22d, W.N.W.; 35, 23d, N.N.W.; 37, 29th, 



N.N.W. 

 Thander and Lightning, 2l8t. 



*The first Qgures denote readings at top of tower, the second at base. 

 t In the ground siielter. 



