METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 fi- Above sea level, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No 193. 



JANUARY, 1905. 



MONTHLY SUMMARY. 



Pressure, In inches. 

 Maxnmini reduced to freezing. 30.38. nth, 10 A- 

 M ininiuni reduced to freezing, 29.03, 7th, 3 p. 

 Keducedf maximum reading, 30.70, nth, 10 a. 

 Keducedt minimum reading, 29.33, 7t'i. 3 P- 



Mean semi-daily reduced, 30.0S4 



Monthly range 1-37 



*Air Tetnperatiire. In Deairees Fahr. 



Highest 5<o. "th, 4 p. 



Lowest -13-0. 24th, 7.30 A. 



Mean hourly, 20.4 



Mean of means of max. and min 20.6 



Mean sensible (wet bulb) ■ 14-0 



Monthly range f'4 o 



Highest mean daily, 41.4,1st 



Lowest mean daily, 1.7. 5th 



Mean maximum 29.1 ] 



Mean minimum 12. oj 



Mean daily range, i7-i| 



Greatest daily range 30.5,24th! 



Least daily range 5-5- 2d 



Hiitniflitif. ! 



Mean dew point 12.8 



Mean force of vapor, I'S 



Mean relative humidity 77-2 



Precipitntioti. In inches. 1 



Total precipitation 3-9° 



Number of days on which .01 incli or more 



rain or melted snow fell, 11 



Total snow in inches 21; 



Snow on ground at end of month, 8 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



lyind. 



Total movement jiSom. 



Greatest daily movement, .... 475 m., 4th 



Least daily movement 4 '!'•, 21st 



Mean daily movement 167m. 



Mean hourly velocity, 7.0m. 



Maximum pressure per square foot. 23.5 lbs.= 



69 m. per hour, 4th, 9 A.. X.N.W. 

 Prevailing Direction, West. 

 Summary. 



North. Northwest, 23 per cent. 



West, Northwest 19 " 



West, Southwest, 13 " 



Southwest, 10 " 



South 10 ■' 



(Jtlier directions, 25 " 



Weather. 



Mean cloudiness observed, .... 58 per cent. 



Total cloudiness recorded by the Sun 'J'her- 



mometer, . . . . 175 hrs. = 59 per cent. 



Numter of clear days, 7 



Number of fair days, 9 



Number of cloudy days, 15 



Bright Sunahiite. 



Number of hours recorded, . . . 119 hrs. = 41* 



Rain, 2d, 7tli, iith, 12th. 19th. 



Snou-, 3d, 4th. 6tli, 8th, loth, nth. i7tli, 21st, 



22d, 24th, 25th, 28th. 



Oales, 3; miles or more per hour, 44m. 3d. 



N.N.W.; 69m. 4th. N.N.W.: ;2m. 7th. E. 



S.E. ; 37m.8th, S.W.: 3(ini. loth. W.; 36m. 



i2th, W.: 41m. i6th, .^. : 41m. 19th, S. : 



6om. 25th, N.N.W.: joni. 26th. N. W. 

 Da>s of -Sleighing, 28 



