METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, ■ 



Lutitiide, 42° 23' IS.f)" N. Lonjritiule, 72° 31' 10" W. 



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



BULLETIN No 42. 



JUNE, 1892. 



MONTHLY SUMMARY. 



Pressure. In inclics. 

 Actual maximum readiiifj, . . 30.11, 4tli, 9 A. 

 Actual minimum reailiiiji, . .29.28,20111, 2 i". 



Mean ivduccil to sea level, 2y.92o 



.Monthly range ,S.'! 



*Air Tfinperntitre. In Degrees Fahr. 



Highest, 92. ; 9.5. 



Lowest 49. ; 41. 



Mean 70.:{; 69.3 



Monthly Range, 43. ; 54. 



Highest mean daily, 82.1; 77. 



Lowest mean daily, (j3.1;(J0.7 



Mean maximum, 78.0; 81.4 



Mean minimum, 61. 7; 57.2 



Mean daily range, 16 9; 24.2 



Greatest daily I'ange, 30. ;41. 



Least dally range, 5. ; 11.5 



II II tiud ity . 



Mean dew point 62.3 



..... .8683 



68.9 



Mean force of vapor, . 



Mean relative humidity 



Wind. 

 I'revailing Directions. 



.South West, 20per(;ent 



South 19 " " 



.South, South West, 14 " " 



Noi-th West, . . 10 " " 



Other directions, ....... 37 •< " 



Total movement 450° ni 



Greatest daily movement, . . . . 286 m., 20th. 



Least daily movement, 28 m., 9th. 



Mean daily movement 1.50 m. 



Mean hfiurly velocity, (!.3 m. 



Maximum pressur<! per squar-e foot, 2oyi)s.= 

 64 ni. per hour, 30th, at 3 P. 



* I'reci/iHiitioii. In inches. 

 Toial precipitation, 2.61; 3.46 



Wentlier. 



Mean cloudiness ol)sci-ved, . . . 50 per cent. 



Number of clear days, 8 



Number of fairdays, 12 



Number of cloudy days 10 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 238 hours tn- 48 per cent. 

 Number of days on which .01 inch or more 

 rain or melted snow fell, 10 



Bright Situshine. 



Number of Hours recorded, 218 



Rnhi, 2d, 4th, .5th, 8th, 9th, 14th, 17th, 20th, 

 21st, 23d, 2.5th, 26th, 27th, 2Sth, .30th. 



Rahihotv 14th, 23d, 26th, :50th. 



Thunder rtntl Lu/htnin{/. 2d, 9tli, 14th, 17th. 

 23d, 27th, ;!Otll. 



Mean Osone, 39 per cent. 



Solar 



Halos. 



4th, 8th, 10th, 11th, 13th, 14tli, 29tli. 



Coronae, ... 5th, 7th. 



Grt/es, of .50ormore miles per hour, . .55, 14th, 

 S. W.; 51, 20th, N. W. ; 64, 30th, S. W. 



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



