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, zyj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 168. 



DECEMBER. 1902. 



MONTHLY SUMMARY. 



freaaure. In inches. 



Maximum reduced to freezing, 30.42, 15th, 10 A 

 Minimum reduced to freezing, 29.09, 5th, 11 p 

 Reduced^ maximum reading, 30.75, 15th, lo A 

 Reducedt minimum reading, 29.41, 5th, 11 p 



Mean tri-daily reduced, 30.058 



Monthly range • 1.34 



*Air Temperature. In Degrees Fahr. 



Highest,. ., 49-o> '6th, 6 p. 



Lowest — 15.0, loth, I A. 



Mean hourly, 23.5 



Mean of means of max. and min., .... 23.7 



Mean sensible (wet bulb), 21.3 



Monthly range 64.0 



Highest mean daily 41. i, 22d 



Lowest mean daily — 6.0, gth 



Mean maximum, 33.6 



Mean minimum, 13.9 



Mean daily range, 19.7 



Greatest daily range, 54.0, loth 



Least daily range, 6.0, 13th 



Utitniiliti/. 



Mean dew point, 15.0 



Mean force of vapor 145 



Mean relative humidity, 72.5 



Precipitation. In inches. 



Total precipitation, 4.27 



Number of days on which .01 inch or more 



rain or melted snow fell 17 



Snow, total in inches 26.5 



Snow on ground at end of month 6.0 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 40iSni. 



Greatest daily movement, 340m., 5th. 



I-east daily movement, 3m., 7th. 



Mean daily movement 129.6 m. 



Mean hourly velocity, 5-4 ni. 



Maxinmni pressure per square foot, 12.5 lbs.= 



50 m. per hour, Sth, 12 M., W.S.W. 

 Prevailing Direction, West, Nowthwest. 



Summary. 



North, Northwest 26 per cent. 



Northwest, 13 " " 



West, Northwest, 10 " '' 



West, 10 " " 



South, 10 " " 



Other directions, 31 " " 



Weather. 



iMean cloudiness observed, .... 60 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 164 hrs.= 58 per cent 



Number of clear days, 9 



Number of fair days, 6 



Number of cloudy days, 16 



Hright Sutishiiie, 



Number of hours recorded, . . . ii9]irs. = 42* 

 Itain, 3d, 15th, 2ist, 22d, 29th, 30th. 

 Snow, 5th, 7th, loth, nth, 12th, 13th, 14th, 



15th, i6th, 18th, 2ist, 22d, 25th, 2bth, 27th, 



29th, 3otii. 

 Galea, 35 miles or more per hour, 48 m. 5th, 



N.N.W.; 50 m. Sth W.S.W.; 38m. i6th, S. 



S.E.; 44 m. iSth, W.S.W. 

 Number of days sleighing, 27 



