METEOROLOGICAL OBSERVATORY 



Hatch Experiiiieiit Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, ■ 



Liititmle, 42° 2;V 48.5" N. Lonoitiide, 72° 31' 10" W. 



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



BULLETIN No 52. 



APRIL, 1893. 



MONTHLY SLfMiVlARY. 



I'ressiire. In inclies. 

 Actual maxiinum reading, 30.35, 7th, "i-30 A. 

 Actual iniiuinum reading, . . 2!M2, 4th, 5 P. 



Mean I'ecliiceil to sea level, 30.08(! 



Monthly range 1.2:1 



*Air 'Vetnperature. In Degree.s Fahr. 



Highest, G7, GT..'), :iiitli 



Lowest 26, lit, 7th 



Mean 44.7; 43. 



Monthly Range 41. ; 48..5 



Highest mean daily 56. ; 53.7 



Lowest mean daily, 31.6; 26. 



Mean maxinnim, 53.4; ,14.7 



Mean minimum, 37.2; 31.3 



Mean daily range, 16.2; 23.3 



Greatest daily range, 2S. ; 38. 



Least ilaily range, 3. ; 10. 



Uutnidity. 



Mean dew point, 31.4 



Mean force of vapor, 2993 



Mean relative liiimidity, 64.8 



Wiml. 

 Prevailing Directions. 



Northwest, 16 per cent. 



North 14 " 



South West 12 " " 



South, 10 " 



Other directions, 48 " " 



Total movement, .'j>S4 m. 



Greatest ilaily movement, . . . 371 ni., .ith. 



Least daily movement, 75 m.; 17th. 



Mean daily movement, 17!i m. 



Mean hourly velocity 7.4 m. 



Maximum pressure per squixre foot, 24^ll)s.= 

 7U m. per hour, 5th, at 1-.30 A. 



*Freciititittion . In inches. 



Total precii»itation, 2.20; 4.41 



Weather. 



Mean cloudiness observed, . . . 55 per cent. 



Number of clear days, 5 



Number of fair days, 12 



Number of cloudy days, 13 



Total cloudiness recor<le<l by the Sun Ther- 

 mometer, . . . 236 hour's or .59 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 



Frost, . 7th, 10th, 11th, 12th, 16th, 17th, 19th, 

 23d, 26th. 



Kright Sunshine. 



Number of Hours recorded, 166 



Rain. 1st, 3d, 4th. 7th, 8th, 12th, 13th, 14th, 

 15th, 20th, 21st, 22d,25th, 27th. 30th. 



Hail, l.ith, 20th. 



Snoir, . . . 6th, 7th, 1.5th, ISth, 20th, 21st. 



Total fall in inches, 7 



Thunder and LiffJttning, Sth. 



Mean Ozone, 32 per cent. 



JIalos. 



Solar lOlh, 12th, 24th. 



Lunar, 2d, 24th, 26th. 



Corona, 24th. 



Gales, of 35 or more miles per hour, 42, 1st; 

 S.W.; 42,2(1, N.W.; 36, :ld, S.W.; 60, 4th, 

 N.W.;70, .5th, N.W.; 37,14th, N.N.E.; 56, 

 l.ith, N.W.; 39, Kith, N.E. ; 41, IStli. N.W; 

 41, 26tli, N.N.E.; 4.5, 2Slh, W.; 36, 30th, N. 



*riie lirst ligur(!s dmiote i-eadings at top of tower, the second at base. 



