METEOROLOGICAL OBSERVATORY 



OF THE 



Ilatch 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. 79. 



JULY, 1895. 



MONTHLY SUMMARY. 



Pressure, In Inches 

 Actual maximum reading, . . 30.05,3il, 7 A. 

 Actual minimum reading, . . 29.55, 25th, 2 P. 



Mean reiUiced to sea level, 30.031 



Monthly range, .50 



*Air Tetnperatiire. In Degrees Fahr. 



Highest, 91; 90,21st 



Lowest,. .' 49, 14th ; 46, 2d 



Mean 69.2; 67.6 



Monthly Range, 42. ; 44. 



Highest mean daily, 80.4 ; 78. 



Lowest mean daily, 60.3; 59. 



Mean maximum, 79.3; 79.2 



Mean minimum, 58.7; 55.9 



Mean daily range 20.7; 23.3 



Greatest daily range 32. ; 35. 



Least daily range, 3. ; 7. 



Humidity. 



Mean dew point, 59.3 



Mean force of vapor, 7662 



Mean relative humidity, 72.7 



Wind. 

 Prevailing Directions. 



South West, 15 per 



South 19 



South South West 10 



North, IS 



Other directions, .38 



cent. 



Total movement, 2934 m. 



Greatest daily movement, . . . 218 ta., .30th 

 Least daily movement 29 m.; 19th 



Mean daily movement, 94 m. 



Mean hourly velocity 3.9 m. 



Maximum pressure per square foot, 81bs.= 

 40 m. per hour, 13th, at 1.30 P. M. 

 * Precipitation. In inches. 



Total precipitation, 3.87 



Weather. 



Mean cloudiness observed, . . 58.5 per cent. 



Number of clear days 9 



Number of fair days 10 



Number of cloudy days, 12 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 270 hours or 58.4 per cent. 



Number of days on which .01 inch or more 



rain fell 10 



Bright Sunshine. 



Number of Hours recorded 192 



Rain, 4th, 5th, 6th, 9th, 13th, 14th, 10th, 21st, 

 27th, 28th, 30th. 



Hail, 13th. 



Jtainhotc, 13th. 



Thunder and Lightning, 6th, 13th, 2l8t, 

 27th, .30th. 



Mea)i Ozone, ... 16 per cent. 



Gales, of 35 or more miles per hour,40, 13th, 

 N.E.;39,30ih, S.E. 



*Tlie flrat figures denote readings at top of tower, the second at base. 



