METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 ft. Above sea level, z'jj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 180. 



DECEMBER, 1903. 



MONTHLY SUMMARY. 



Pre»aure. In inches. I 



Maximum reduced tofreezing, 30.27, iQth, 10 a. 

 Minimum reduced to freezing, 2.S.73, loth, 3 A. 

 Keducedt maximum reading, 30.60, 19th, 10 A. 

 Reducedt minimum reading, 29.04, loth, 3A- 



Mean tri-daily reduced 29.967 



Monthly range • 1.36 



*Air Temperature. In Degrees Fahr. 



Highest, 52.0, 20th, 7 P- 



Lowest —9.5, 27th, 6 A. 



Mean hourly, 22.5 



Mean of means of max. and min 22.1 



Mean sensible (wet bulb), 21.1 



Monthly range 61.1; 



Higiiest mean daily 35.8,21st 



Lowestmean daily 5-5. 27th, 29th 



Mean maximum 3 



Mean minimum 12.9 



Mean daily range, 18.5 



Greatest daily range, 3S.0, 20th 



Least daily range, 7-?' 3d 



HuniidUy. 



Mean dew point, 16.1 



Mean force of vapor, i35 



Mean relative humidity, 76.5 



frecipltntion. In inches. 



Total precipitation 3.95 



Number of days on which .01 inch or more 



rain or melted snow fell, S 



Snow, total in inches 12 



Snowon ground at end of month, . .4 inches 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 4994 ni. 



Greatest daily movement, .... 316m., 13th 



Least daily movement, 7ni., ist 



Mean daily movement, i6ini. 



Mean hourly velocity, 6.7m. 



Maximum pressure per square foot, 17.0 lbs. = 



58 m. per hour, 13th, 12 M., W. 

 Prevailing Direction, West, Southwest. 



Summary. 



West, 23 per cent. 



North, 19 " " 



South, 16 " " 



Southwest, 13 " " 



Other directions, 29 " " 



Weather. 

 Mean cloudiness observed, .... 49 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 154 hrs.=54 per cent. 



Number of clear days, 9 



Number of fair days, 7 



Number of cloudy days, 15 



Bright Sunshine. 

 Number of hours recorded, . . . 129 hrs.=46j( 

 Rain, 9th, I3tli, 20th, 24th. 

 Snotv, 2nd, 3rd, 5th. 9th, 13th, 20th, 22nd, 26th, 



27th, 29th, 31st. 

 Gales, 3; miles or more per hour, 5Sm. 13th, 

 W\; 46 m. 20th, S.; 40 m. 21st, W.N.W.; 51 

 m. 22nd, W.N. W.; 39 m. 24th, S.; 47 m. 

 28th, W.N.W. 

 Days of sleighing, 3 



