METEOROLOGICAL OBSERVATORY 



OK THK 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42" 23' 48.5" N. Longitude 72° 31' 10" W. 



Height of barometer above ground, ^i ft. Above sea level, 2^3.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 206. 



FEBRUARY, 1906. 



MONTHLY SUMMARY. 



yresanre. In iiTches. 



Maximum leduced to freezing, 30.63, nth, ti a. 

 Minimum reduced to.freezing, 29.34, 28th. 5 A. 

 Reducedt maximum reading, 30.95, nth, n a. 

 Reduced! minimum reading, 29.67, 28th, 5 A. 



Mean semi-daily reduced, 30.203 



Monthly range 1.2S 



* Air Temperature. In Degrees Fahr. 



Highest 52.5, 24th, 5 P. 



Lowest -5.0, 6th, 7 A. : nth, 7 A. 



Mean hourly, 23.S 



Mean of means of max. and min 24.1 



Mean sensible (wet bulb), 20.3 



Monthly range, 57.5 



Highest mean daily, 41.0,21st 



Lowest mean daily, 4.7, 6th 



Mean maximum, 36.3 



Mean minimum 11.9 



Mean daily range 24.4 



Greatest daily range, 40.5. 17th 



r^east daily range, 6.0.9th 



Ifnitiiditif. 



Mean dew point 15.2 



Mean force of vapor, 134 



Mean relative humidity 77.4 



Frecipitntion. In inches. 



Total precipitation, 2.73 



Number of days on which .01 incli or more 



rain or melted snow fell, 6 



Total snow in inches 13 



Snow on ground at end of month, . . . none 



* Temperature in ground shelter. 

 \ Reduced to freezing and sea-level. 



Total movement 4565 ni. 



Greatest daily movement, .... 572 ni., 2Sth 



Least daily movement i m., 14th 



Mean daily movement, 163 m. 



Mean hourly velocity, 6.Sm. 



Maximum pressure per square foot, 8.5 lbs.= 

 41 m. per hour, 27th, n p., N. ; 2Sth', 10 A., 



N. 



Maximum velocity for 5 minutes, 34 m. per 

 hour 27th, 11:30 P., N. 



Prevailing Direction, West, Northwest. 



Summary. 



North, Northwest, 25 percent. 



North 14 " " 



South, 14 " " 



South, Southeast, n " " 



South, .Southwest, • 11 " " 



Northwest • . . ii " " 



Other directions, 14 " " 



^%'^enther. 



Mean cloudiness observed, - . . .44 per cent. 



Total cloudiness recorded by the .Sun Ther- 

 mometer, . ... ii3hrs.=38 per cent. 



Number of clear days, 12 



Number of fair days, 9 



Number of cloudy days, 7 



Bright Sunshine. 



Number of hours recorded, . . 183 hrs.=62^ 



linin, 14th, 20th, 2ist, 25th. 



Galea, ^i"^ miles or more per hour, 36m. 6th, 



N.; 37m.22d. N.; 41m. 27th, N.: 4im.2Sth, 



N. 

 Siioic, 5th. 9th, 14th, 15th, 18th. 

 Days of Sleighing, 13 



