METEOROLOGICAL OBSERVATORY 



OF THE 



Hatcli 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. 69. 



SEPTEMBER, 1894. 



MONTHLY SUMMARY- 



Pressure. In Inches. 



Actual maximum reading, ;?0.34, 13th, 8 a- 

 Actual minimum reading, 29.26, 10th, 3-30 p. 



Mean reduced to sea level, 30.143 



Monthly range, 1.08 



*Air Temperature. In Degrees Fahr. 



Highest 87.; 9th, 9J.;10th 



Lowest, 38 ; 35., 26th 



Mean, 64.8; 65.5 



Monthly Range 49. ;56, 



Highest mean dally, 76.1; 76.5 



Lowest mean daily 48.7 ; .50.7 



Mean maximum," 74.3; 77.7 



Mean minimum .56.2; 53.2 



Mean daily range, 18. ; 24.5 



Greatest daily range 31.; 41.5 



Least daily range 7. ; 8 



Humidity. 



Mean dew point, 56.2 



Mean force of vapor, 6553 



Mean relative humidity 74.4 



Wind. 



Prevailing Directions. 



South 12 percent. 



South West - 21 " " 



North, 12 " " 



South East "..... 11 " " 



Other directions, 44 " " 



Total movement 1414 m. 



Greatest daily movement, . . . If2 m., 30th. 

 Least daily movement, Cm.; 29th. 



Mean dally movement 47. m. 



Mean hourly velocity, 2. m. 



Maximum pressure per square foot, 13 lb8.= 

 51 m. per hour, 10th, at 4 p. M. 



* Precipitation. In inches. 

 Total precipitation 2.38; 4.63 



Weather. 



Mean fjloudiness observed, . . 53.2 per cent. 



Number of clear days Iq 



Number of fair days, . 7 



Number of cloudy days 13 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . 220 hours or 55.5 per cent. 

 Number of days on which .01 inch or more 



rain fell, 8 



Frost, 26th. 



Bright Stmshine. 



Number of Hours recorded 176 



Rain, . 6th, 8th, 10th, 14th, ]5th,16th,19th,20th. 



Rainbow, 20th. 



Thunder and Tjightning, lOth, 16th, 20th. 

 Mean Ozone, ....... 29.3 per cent. 



Oales, of 35 or more miles per hour, 51, loth, 

 S. W.; 38, 11th, N.W.; 38, 20th, S. W ; 35, 

 24th, W. 



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



