METEOROLOGICAL OBSERVATORY 



Hatch Experiment 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. 26, 



FEBRUARY, 1891 



iVloNTHLY SUMMARY. 



Prettxiirc. Jn inches. 

 Actual niaximtiiii reading, . 30.38."), -iid, 6 A. 

 Actual inininiuiu reading', . . . 20.03, 3d, G p. 



Mean reduced to sea level, 30.041 



Monthly range, ].. 3.5.5 



*Air Tempf'rnturr. In Degrees Fahr. 



Highest, .5-2. ; 54 



Lowest, 0.0 ;— 6. 



Mean, 29.G;37.6 



Monthly Range, .52. ; 60. 



Uighest mean daily, 47.1; 4.5. 



Lowest mean daily, 16.; 11. 



Mean ma.ximum, 36.1; 37. G 



Mean minimum, 22.1;17.G 



Mean daily range, 14.2; 20. 



Gi-eatest daily range 32. ; 36. 



Least daily range 35; 8. .5 



Jlttiniditi/. 



Mean dew point, 21.' 



Mean force of vapor 189' 



Mean relative humidity, G0.4 



Wind. 



Prevailing Directions. 



North West, . . . • 17 per cent 



North, 13 " 



South South West, 12 " " 



South West, 9 " " 



Other directions, 49 " " 



Total movement, 47.59 m 



Greatest daily movement, .... 354 m., 4th 

 Least daily movement, 13 ni., 9th 



Mean daily movement 170 m. 



Mean hourly velocity G.l ni. 



Maximum pressure per s(iuai"C foot,13Ul)S.^ 

 .52 m. per hour, 10th, at 12 M. 



* Precipitation. In inches. 



Total precipitation, 3.13; 4.23 



Wentlier. 

 Mean cloudiness observed, . . . .59 per cent. 



Number of clear days 9 



Xundjer of cloudy days, 9 



Number of fair days 10 



Total (iloudiness recorded by the Sun Ther- 

 mometer, 173 hours or 58 v>er cent. 

 Xumlter of days on whicli .01 inch or more 



rain or snow fell, 13 



Depth of snow, in inches, on ground at close 

 of mouth, 3 



Bright Sunshine. 

 Number of Hours recorded, 1.24 



Snow, 6th, 7th, Sth, 9tli, 20th, 26th, 28th. 



Total Fall in inches, 16 



Kain, l.«t. 3d, 9th, 10th, 16th, 17th, 18th, 20tli, 

 21st, 2.5th. 



Hnil, 9th, 20th. 



Liffhttiitif/, 28th. 



Mean Ozone, 49 per cent. 



Balos. 



Solar, 5th, 6th, 7th, 2.3d, 28th. 



Lunar 1.5th, inth. 



Lunar coronae, ir)tli, 18tli, 19th, 2'id. 



Gales, of .50or more miles jier hour, .52, N.w., 

 10th. 



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



