METEOROLOGICAL OBSERVATORY 



Hatch Experiiiieiit 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. 76. 



APRIL, 1895. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Actual maximum reatling, . ;>0.4U, 12tli, 7 a. 

 Actual minimum rcatling, . . 29. OU, 9tli, 9 P. 



Mean reduceil to sea level 30.119 



Monthly range, 1.400 



*Air Temperature. lu Degrees Fahr. 



Highest, 79; 81,25th 



Lowest, 28, ;2r).,4th 



Mean, 46.9; 45.6 



Monthly Range 51.; 56. 



Higliest mean daily, 64.2; 64. 



Lowest mean daily, 35.4; 33. 



.Mean maximum 56.8; 56.6 



Mean minimum, 37.6; 34.6 



Mean daily range, 19.2; 22. 



Greatest daily range, 38. ; 41. 



Least daily range, 7. ; 10. 



Hnmiditif. 



Mean dew point 35.8 



Mean force of vapor 3433 



Mean relative humidity, 68.1 



Wind. 

 Prevailing Directions. 



South West 12 per cent. 



North West, 14 " " 



North 18 " " 



.South, 16 " " 



Other directions 40 " " 



Total movement 4098 ni. 



Greatest dally movement, . . . 320 m., 10th 

 Least daily movement lm.;7th 



Mean daily movement 137 m. 



Mean hourly velocity, 5.7 m- 



Maximum pressure per square foot, 101bs.= 

 45 m. per hour, 22nd, at 5 A. 



* freclpitation. In inches. 



Total precipitation, 5.56 



Weather. 

 Mean cloudiness observed, ... 54 per cent. 



Number of clear days, 9 



Number of fair days 8 



Number of cloudy days, 13 



Total cloudiness recorded by the Sun Ther- 

 mometer, .... 234 hours or 58 per cent. 

 Number of days on which .01 inch or more 



rain or melted snow fell 13 



Number of inches of snow on the ground at 



the close of the month .0 



aright Stmshine. 



Nnmljer of Hours recorded, 18° 



Bain, lat, 0th, 7th,8th,9th, 10th, 13th, 14th, 15th, 

 22d,27th, 30th. 



Rainbotv, 15th, 25th. 



Show, 3d. 



Total fall in inches 5 



Mean Ozone, 24 per cent. 



Thunder and Lightning, . 9th, 25th, 27th. 

 Halos. 



Solar, 24th, 26th. 



Gales, of 35 or more miles per hour, 44, 4th, 

 W.N.W.; 40, lOih, N.W.; 36, 12th, S.S.W. ; 

 44, 13th, S.; 36, ]6th,N.N.E.;40, 19th,N.;45, 

 22ud, S. ; 41, 23d, W.N.W.; 37, 24th, S.W. ; 

 36, 2.5th, S. 



'The first flgurcs denote readings at top of tower, the second at base. 



