METEOnOLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



.A.Is/i:i^ER,ST. 



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. 81. 



SEPTEMBER, 1895. 



MONTHLY SUMiVIARY. 



I'resgni'c. In inches. ;Total movement 3444 ni. 



Actual maximum reading, . . 30.12,7 A. 1.5th G>-<-itest daily movement,- . . . 230 m., i:?th 



Actual minimum reading,. . 09.45, 2 F. 18th I>e«^t 'I'-ii'y >"0^ement 39 m.; loth 



Moan reiluced to sea level, 30.097 >!«="> <laily movement, 114.8 m. 



Monthly range, O.C/iMean hourly velocity 4.8 m. 



Maximum pressure per square foot, 43 ll)s.= 

 *Alr Temperature. In Degrees Fahr. | ,,3 ,^^ per hour, 11th, 3 P.M. 



Highest, 91; 9,, 23d * Precipitation. In inches. 



Lowest, 39; 33, l.ith 



Mean, 63.8; 64.1 Total precipitation 5.04 



Monthly Range, 52. ; 64. Weather. 



Highest mean daily '^'■1> -'stj]yjeji„ ^10^11^033 observed, . . 42.4 per cent. 



Lowest mean daily, •''''■1' '^'^^h ,^^,^^5^^^. ^f clear days 15 



-Mean maximum 74.1; 'f^-l Number of fair days, 10 



Mean minimum 51.0; 49.-9,jj,„j,,,gj. ^^ cloudy days, 5 



Mean daily range -0-1 J -*-5 Total cloudiness recorded by the Sun Tlier- 



Greatest daily range, . . . . 32. 9th; 41. 3d mometer, . . . 120 hours or 32.1 per cent. 

 Least daily range, ... 9, 18th, 29th; 17, 29th >jjj„,,jgj. ^j j^ys on which .01 inch or more 



Uirmidity. rain fell, H 



Mean dew point, .'il.y Bright Sunshine. 



Mean force of vapor, 64(5 Number of Hours recorded 2r)4 



Rain, 9th, 10th, Uth, l.:th, 16th, 18th, 26th, 

 29th, 30th. 



Mean relative humidity 73.7 



Wind. 

 I'revailing Directions. 



South West 27 per cent. 



West 13 " " 



North West 13 " " 



Other directions, ....... 47 " " 



Hail, nth 



Thunder and fJyhtniiu/, 11th, 12th, 26th, 



Mean O-one, 20 per cent. 



(ialcx, of 35 or more miles per hour, 93, 1 Uli, 

 N.K.; 39, 13th, N.W.; 35, 14th, N. 



♦The lir.st ligures denote readings at top of tower, the second at l«ase. 



