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. 56. 



AUGUST. 1893. 



MONTHLY SUMMARY- 



Pressure. In Inches. 

 Actual maximum reading, . . 30.02, 23rd, 7 A. 

 Actual minimum reading, . . 29.09, 29tli, 2 p. 



Mean reduced to sea level 30.001 



Monthly range 93 



*Air TeinperaUtre. In Degrees Fahr. 



Highest, 94, 9th ; 96, 10th 



Lowest 52 ; 39, 14th 



Mean 71. ; 69.2 



Monthly Range 42. ; 57. 



Highest mean daily, 78.6; 77.2 



Lowest mean daily, 62.1 ; .59. 



Mean maximum 81. ; 82.6 



Mean minimum 62.2; 55.7 



Mean daily range 18.8; 26.9 



Greatest daily range, 32. ; 42. 



Least daily range 3. ; 10. 



Htimidity. 



Mean dew point, 59.9 



Mean force of vapor, 7775 



Mean relative humidity, 70.7 



Wind. 

 Prevailing Directions. 



North, 17 percent. 



South West 15 " " 



South, .' 13 " " 



North West, 11 " 



Other directions 44 " " 



Total movement, 4126 m. 



Greatest daily movement, ... 467 m., 29th. 



Least daily movement, 31m.; 0th. 



Mean daily movement 133 m. 



Mean hourly velocity, 5.5 m. 



Maximum pressure per square foot, 373lb3.= 

 86im. per hour, 29th, at 3 P. 



* Precipitation. In Inches. 

 Total precipitation, 2.10; 3.49 



Weatlier. 



Mean cloudiness observed, . . 44.8 per cent. 



Number of clear days 12 



Number of fair days, 5 



Number of cloudy days 14 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 203 hours or 47 per cent. 

 Number of days on which .01 inch or more 

 rain fell 13 



Bright Sunshine. 



Number of Hours recorded, 225 



Bain,. . 1st, 5th, 7th, 12th, 17th, 18th, 19th, 

 20th, 21st, 23d, 24th, 26th, 27th, 28th, 29th. 



Thunder and Ijightning, 1st, 7th, 12th, 

 18th, 19ih, 26th, 27th. 



Mean Ozone, 30 per cent. 



Balos. 

 Solar, 4th, 28th. 



Oales, of 35 or more miles per hour, 45, 13th, 

 N.; 30 14th, N.; 37, 15th, N.; 40. 2l8tN.; 

 66, 24th, E.S.E.; 37, 27th, S.W.; 86|, 29th, 

 S. W. 



•The first figures denote readings at top of tower, the second at base. 



