METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 4S.5" N. Longitiido, 72° 31' 10" W. 



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



BULLETIN No 50. 



FEBRUARY, 1893. 



MONTHLY SUMiVlARY. 



Pressure. In inches. 

 Actual maximum reading, . . 30. 52, 5th, 10 a. 

 Actual minimum reading, . . 28.69, 20th, 1 a. 



Mean reduced to sea level, 30.111 



Monthly range, 1.83 



*Air Temperature. In Degrees Fahr. 



Highest, 49. ; 50. 15th 



Lowest 1.; -4.5 5th 



Mean, 25.7; 22.9 



Monthly Range 48. ; 54.5 



Highest mean daily 41.8; 41. 



Lowest mean daily 8.7; 6.7 



Mean maximum, 32.7; 33.7 



Mean minimum 18.9; 12.1 



Mean daily range, 13.7; 21.7 



Greatest daily range, 38. ; 44.5 



Least daily range, . 1. ; 7.5 



Ilinnidit}/. 



Mean dew point, 17.3 



Mean force of vapor, 146:; 



Mean relative humidit}-, 74 



Wind. 

 Prevailing Directions. 



North, 24 per cent. 



North West, 22 " 



West North West, 10 " 



South West, .... 7 " 



Other directions 37 " " 



Total movement, 5242 ni 



Greatest daily movement, . . . 387 ra., 20th 



Least daily movement, 52 m.; 6th 



Mean daily movement 187 m 



Mean hourly velocity, 8 m. 



Maximum pressure i)er squai'e foot, 20 Ibs.= 

 63 m. per hour, 3d, at 11-30 p. 



*Frecipitatioii. In inches. 



Total precipitation, 5.75 



U'entlier. 



Mean cloudiness observed, . . .57 per cent. 



Number of clear days 7 



Number of fair days, 7 



Number of clouily days, 14 



Total cloudiness recorded by the Sun Ther- 

 mometer, ... 185 hours or 62 |)er cent. 

 Number of days on which .01 inch or more 



rain or melted snow fell, lo 



Number of inches of snow on the ground at 

 the close of the monih 15 



Bright Sunshine. 



Number of Hours recorded, Ill 



Rain, 3d, 6th, 7th, 10th. 



Snoiv. 1st, 2<l,4th, 6th, 9th, 10th, 13th, 14th. 

 17th, 18tli, 19th, 22d, 24th, 2.5th, 28th. 



Total fall in inches, 48i{ 



Hail, 3d, 6th. 



Aurora Borealis, 5th, 1.5th. 



Mean Ozone, .38 per cent. 



Hal OS. 



Solar nth, 12th, 28th. 



Lunar, Ist. 



Gales,of'Anor more miles per hour, 44, 2d, 



X.; 63. 3(1, V. W.; 52, 4th, N.W.; 36, 5th, 



N.;49, 7th, W.; 40, 8th, N.W.; .53, 10th, S. 



W.: :W, I4th, N.E. ; 35,1.5th, W.N. W.; 



.39, 16th, N.W.; 62, 20th, N.W.; 48, 22d, N. 



37, 23d, N. N. W. 



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



