METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Liititiide, 42° 23' 4S.ry' N. Lougitucle, 72° 31' 10" W. 



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



BULLETIN No 49. 



JANUARY, 1893. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Actual niaxiinumreading, . 30.31, iSth, 9-30 A. 

 Actual minimum readins?, . . "28.79, -Id, 4 A. 



Mean reduced to sea level 29.951 



Monthly range 1.5.2 



*Air Temperature. In Degrees Fuhr. 



Highest, 47.5; 50. 2d 



Lowest, -3.; -13. 17th 



Mean, 19.; 16.1 



Monthly Range .50.5; 63. 



Highest mean daily, 41. S; 40. 



Lowest mean daily 4.7; 1.5 



Mean maximum 24.7; 26.4 



Mean minimum, 12.8; 5.8 



Mean daily range, 11.9; 20.0 



Greatest daily range, 22. ; 35. 



Least daily range 3. ; 10. 



Hiitnitlity. 



Mean dew point 13.9 



Mean force of vapor, 1149 



Mean relative humidity, 80.2 



Witul. 

 Prevailing Directions. 



North 19 percent. 



North West, .... IS " " 



South West 12 " " 



North, North East, 9 " 



Other directions 42 " " 



Total movement, 40.56 m. 



Greatest daily movement, . . . 379 m., 6th. 

 Least daily movement 5 m.; 23d. 



Mean daily movement 131 m. 



Mean hourly velocity, 5.4 m. 



Maximum pressure per square foot, 12 lbs.= 

 49 m. per hour, 13th, at 1 P. 



*Preei/>ifatio7i. In inches. 



Total precipitation, 2.52; 3.33 



irentlier. 

 Mean cloudiness observed, . . .52 per cent. 



Number of clear days, 8 



Number of fair days, 11 



Number of cloudy days 12 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . Iii4 hours or .56 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, 7 



Jiright Sunshine, 



Number of Hours recorded, 130 



linin, 1st, 2d, 28th, 29th. 



Snou-, 1st, 2d, 5th, 6th. 7th, 9th, 10th,' 12th. 

 15th, 19th, 23d, 24th, 2.5th, 28th, 31st. 



Total fall in inches, . . 15J 



Mean Ozone, 38 per cent. 



Halos, 



Solar 18th, 26th, 31st. 



Lunar, 29th. 



Coronae, 26th, 27th. 



«f»/''.<i. of 35 or more miles per hour, 44, 2d, 

 N.W. ; m, 3d, S. W.; 42, 6th, N.; 35, 7th, 

 X. W.; 46, 11th. N.N.W.; 49, 1.3th, N. ; 40, 

 17th, N N.E. ; 45, 2.5th, S.W.; 37, 27th, N. 

 W. 



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



