METEOROLOGICAL OBSEHVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE 



^^]S/fl::t3: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- 37. 



JANUARY, 1892. 



MONTHLY SUMiVlARY. 



Pressure. In inches. 

 Actual maximum reading, . 30.35, 17th, 10 A. 

 Actual minimum reading, . 28.99, 6th, 10 P. 



Mean reduced to sea level 29.965 



Monthly range 1.36 



*Air Temperature. In Degrees Fahr. 



Highest 53. ; 57. 



Lowest 0.0; -9.5 



Mean, 25.3; 23.6 



Monthly Range, .53. ; 66.5 



Highest mean daily 44.6; 44.3 



Lowest mean daily, 7. ; 99 



Mean maximum 32.1; 34.4 



Mean minimum 18.8; 12.9 



Mean daily range, 13.3; 21.5 



Greatest daily range, 33.5; 39.5 



Least daily range, 3; 7.5 



Hutnidity. 



Mean dew point, 18.8 



Mean force of vapor, 1868 



Mean relative humidity, . 73.7 



Wind. 

 Prevailing Directions. 



North North East, 24 per cent. 



South West 18 " 



North, 13 " " 



South, 10 " 



Other directions, 35 " " 



Total movement, 5059 m. 



Greatest daily movement, . . . 306 m., loth. 

 Least daily movement, 16m., 18tli. 



Mean daily movement, 163.2 ni. 



Mean hourly velocity, 6.8 ra. 



Maximum pressure per square foot,10^1bs.= 

 46 m. per hour, 26th, at 1-30 p. 

 * Precipitaiion. In inches. 



Total precipitation, 3.77 ; 5.85 



Weather. 



Mean cloudiness observed, ... 63 per cent. 



Number of clear days 8 



Number of fair days, 9 



Number of cloudy days, 14 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 166 hours or .'56 per cent. 



Number of days on which .01 inch or more 

 rain or melted snow fell, .... . . 10 



Number of inches of snow on the ground at 



the close of the month, 2 inches. 



Bright Sunshine. 



Number of Hours recorded 128 



Krtin, . . . 2d, 12th, 13th, 14th, 18th, 19th, 



Snoiv, 3d, 6th, 7th, 8th, 9th, 11th, 15th, 18th, 

 19th, 23d, 24th, 30th. 



Total fall in inches, 13. 



Hail, 18th. 



Aurora Boreal is, 5th. 



Mean Ozone, 49 per cent. 



Halos. 



Solar, 10th. 



Lunar, 10th. 



Corona Sth. 



Oales, of 40 or more miles per hour, 46, i!6th, 

 N. W. 



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



