METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE 



.a.:m[:e3:ek,sx. 



Lulitiide, 42° 23' 48. 5" N. Longitude, 72° 31' 10" W. 



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



BULLETIN No 35. 



NOVEMBER, 1891 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Actual maximum reading, . 30.44, 19th, 10 A. 

 Actual minimum reading, . -JiS.OO, 'i3rd, !( P. 



Mean reduced to sea level, *J0.117 



Monthly range, 1.54 



*Air Temperature. In Degrees Fahr. 



Highest, 60; 64. 



Lowest 8; 3.5 



Mean, 39.7; 38.1 



Monthly Range, 5-2 ; 60.5 



Highest mean daily 55.8; 53.9 



Lowest mean daily, 17.7; 15 5 



Mean maximum 46.3; 49.7 



Mean minimum, 32.7; 26.6 



Mean daily range 13.6; 23.) 



Greatest daily range, 24. ; 39. 



Least daily range, 7; 13. 



Humidity. 



Mean dew point 30.4 



Mean force of vapor 2839 



Mean relative humidity, 68.7 



Wind. 



Prevailing Directions. 



South 18 per cent. 



North West 14 " 



North, 13 " " 



South West, 11 " 



Other directions, 44 " " 



Total movement, 5215 m. 



Greatest daily movement, . . . 382 m., 17th. 



Least daily movement 36m., 4th. 



Mean daily movement 173.8 m. 



Mean hourly velocity, 7.2 m. 



Maximum pressure per square foot,1531b8.= 

 .56 m. per hour, 17th, at 2 p.m. 



* Precipitation. In inches. 

 Total precipitation 1.44; 2.99 



Weather. 



Mean cloudiness observed, ... 50 per cent. 



Number of clear days 12 



Number of fair days, 7 



Number of cloudy days, 11 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 153 hours or .52 per cent. 

 Number of days on which .01 inch or more 

 rain fell, 8 



Bright Sunshine. 



Number of Hours recorded 141 



Rain, 10th, llth, 16th, 17th, 23d, 26th, 27th, 

 28th. 



Snoii', 26th, 28th. 



Mean Ozone, 42 per cent. 



Halos. 



Solar 21st. 



Lunar, 19th. 



Coronae 13th, 17th. 



Gales, of 40 or more miles or more per hour, 

 56, 17th, S. W.; 48, 23d, S. 



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



