METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above groimd, ST ft. Above sea level, 2jj.s ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 169. 



JANUARY, 1903. 



MONTHLY SUMMARY. 



Jfressure. In inches. 

 Maximum reduced to freezing, 30.28, 3otIi, 11 A. 

 Minimum reduced to freezing, 28. Si, Sth, 4 a. 

 Reduced! maximum reading, 30.62, 2otli, 11 a. 

 Reduced* minimum reading, 29.13,8th, 4 a. 



Mean tri-daily reduced, 29.906 



Montlilv range • 1.49 



*Air Tfiitjipytitiire. In Degrees Fahr. 



Highest, 45o, 2d, 3 p. 



Lowest — 12.0, 2otli, 9 A. 



Mean hourly, 24.3 



Mean of means of max. and min., .... 24.2 



Mean sensible (wet bulb), 22.5 



Monthly range 57.; 



Highest mean daily 37.5,4th 



Lowest mean daily, 3.0, 19th 



Mean maximum, 32.5 



Mean minimum, 15.8 



Mean daily range, 16.7 



Greatest daily range 3S.0, 20th 



Least daily range, 6.0, 3d, 4th 



Uuinidit!/. 



.Mean dew point, 16.0 



Mean force of vapor 147 



Mean relative humidity, 72.1 



t'fecipitiition. In inches. 



Total precipitation, 3. 28 



Number of days on which .01 inch or more 



rain or melted snow fell, 10. 



Snow, total in inches, 8.5 



Snow on ground at end of month, .... 3.0 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



n'ind. 



Total movement 4254m. 



Greatest daily movement, .... 381111., 31st. 



Least daily movement 15111. ,20th- 



Mean daily movement -i37ni. 



Mean hourly velocity, 5-7 ni. 



Maximum pressure per square foot, 12.5 lbs.= 



50 m. per hour, 31st, 11:30 A. m., W. 

 Prevailing Direction, West, Southwest. 

 -Summary. 



West, Northwest, 13 per cent. 



West, 13 " " 



West, Southwest '3 '" '' 



Northwest, 10 '' " 



Southwest, 10 " " 



South, Southeast, 10 " " 



Otiier directions, 31 " " 



Wentlier. 



Mean cloudiness observed, . . . . 61 per cent. 



'J'otai cloudiness recorded by the Sun Ther- 

 mometer, 180 his. =61 per cent. 



Number of clear days, 6 



Number of fair days, 9 



Number of cloudy days, 16 



Itriffht Sunshine. 



Number of hours recorded, . . . ii4hrs.=39?( 



Rftin, 2d. 3d, 6th, 7th, iith, 2i4t, 25th, 26th, 

 28th, 29th, 30th. 



SH««r,6th, 7th, nth, 15th, 16th, 25th, 26tli, 

 30th. 



Onleg, 35 miles or more per hour, 46m. 12th, 

 W.S.W.; 35m. i3th,S.S.W.; 42111. i8th,W.; 

 37 m. 23d, W.N.W.; 41m. 30th, W.S.W.; 

 50111. 31st, W. 



Number of days sleighing 31 



