METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experifflent Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



.A-HVEHEE-ST. 



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



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



BULLETIN No 58. 



OCTOBER, 1893. 



MONTHLY SUMMARY. 



Pressure. In Inches. 

 Aotiial niuximiiin reading, . 30.36, 19th, 11 A. 

 Actual minimum reading, . . 20.00, 14th, 8 a. 



Mean rciluced to sea level, 30.126 



Monthly range, 1.36 



*Air Temperature. In Degrees Fahr. 



Highest, 75, ; 80, 9th 



Lowest 30; 23, 17th 



Mean 53.8 ; 52.6 



Monthly Range, 45. ; 57. 



Highest mean daily 64. ; 65. 



Lowest mean daily, 37. ; 35 



Mean maximum 61.5; 6.T.6 



Mean minimum 46. ; 39.7 



Mean daily range, 15.fi; 25.8 



Greatest daily range, 29. ; 43 



Least daily range, 2. ; 10 



Humidity. 



Mean dew point, 44.2 



Mean force of vapor, 46.53 



Mean relative humidity 67 



Wind. 

 Prevailing Directions. 



South West, 23 per cent. 



South 14 " 



North 13 " " 



North West 13 " 



Other directions 37 " " 



Total movement, 4198 m 



Greatest daily movement, . . . 486 m., 14tli 



Least dally movement 21m.; 17th. 



Mean daily movement, 135 m. 



Mean hourly velocity, 5.6 m. 



Maximum pressure per square foot, 23 lb8.= 

 68m. per hour, 14th, at 3 A. 



* Precipitation. In inches. 

 Total precipitation 2.70; 4.88 



Weather. 



Mean cloudiness observed, . . 40.4 per cent. 



Number of clear days, 10 



Number of fair days 7 



Number of cloudy days 14 



Total cloudiness recorded by the Sun Ther- 

 mometer, ... 160 hours or 46.8 per cent. 

 Number of days on which .01 inch or more 



rain fell 6 



Frost 17th, 18th, 30th, 31st. 



aright Simshine. 



Number of Hours recorded, 182 



Bain, . . 4th, 7th, 14th, 23d, 24th, 27th, 28th. 



Mean Ozone, 27.7 per cent. 



A^urora Itorealis, 2d. 



Halos. 



Solar, 1st, 13th. 



Lunar, 20th, 22d. 



Oales, of 35 or more miles per hour, 47, 1st, 

 N ; 45-2d,N.; 49, '(th, W.N.W.; 36. 10th, 

 N.W.; .5-.!, 13th, S.W.; 68, 14th, S.W.; 46, 

 1.5th, S.W. ; 36, 25th, N.W. ; 51, 29th, S W. 



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



