BULLETIN No. 240. 



DECEMBER, 1908. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPEIIIMEFI 



STATION. 



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



Height of barometer above ground, ^i ft. Above sea level, 2"/ 3.3 ft. 

 Height of Wind Instrumejits 72 ft. 



MONTHLY SUMMARY. 



Fresnure, In inches. 



Maxuiuim reduced to freezing, 30 29, 6th, 10 a. 

 Miniinuiii reduced to freezing, 28.99, 12th, 2 p. 

 Reduced) niaxinuun reading, 30.61, 6th, 10 a- 

 Keducedt mini mum reading, 29.30, 12th, 2 p' 



Mean semi-daily reduced 3o-045 



Monthly range 1.31 



*Air Tfiui>erittiire. In Degrees Fahr. 



Highest, 65.5, ist, 2:30 P. 



Lowest, 2.0, 24th, 6 a 



Mean iiourly, 27.1 



Mean of means of max. and min., .... 27.6 



Mean sensible (wet bulb), 23.4 



Monthly range, 63.5 



Highest mean daily 53.0,1st 



Lowest mean daily, 15.3,23d 



Mean maximum 35.7 



Mean minimum, 19.5 



Mean daily range, 16.2 



Greatest daily range, 3i-5. ist 



Least daily range, 6.0, Sth 



Hnniidity. 



Mean dew point, ii^.6 



Mean force of vapor, 145 



Mean relative humidity, 75.1 



Precipitation. In inclies. 



Total precipitation, 3.05 



Number of days on which .01 inch or more 



rain or melted snow fell, 8 



Total snow in inches, 9 



• Temperature in ground shelter. 

 t Keduced to freezing and sea-level. 



Wind. 



Total movement, 5432m. 



Greatest daily movement, .... 415m., 2d. 



Least daily movement 28111., nth. 



Mean daily movement 175 m. 



Mean hourly velocity, 7.3 i». 



Maximum pressure per square foot, 7.5 lbs.= 



39m. per hour, 31st, ip.. W. 

 Maximum velocity for 5 minutes, 30m. per 



hour iSth, 9P., N.VV. 

 Prevailing Direction, West. 



Summary. 



West 36 per cent 



West Southwest 10 " " 



Northwest 13 " " 



South, It) " " 



Other directions, 25 " " 



Weather. 

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

 Total cloudiness recorded by the Sun Ther- 

 mometer, i5ohrs.=53 per cent. 



Number of clear days, 7 



Number of fair days, 10 



Number of cloudy days, 14 



Bright Siittsliiue, 

 Number of hours recorded. . . 133 hrs.=47?? 

 Rain, ijth. 25th, 30th, 31st. 

 Snow, 2d, 4th, 7th, nth, 12th, 13th. iSth, 21st, 

 25th. 30th. 



Days .Sleighing:, 18 



Gales, 3; miles or more per hour; 35m., 

 i8th.. N.W.;35m., igth, N.W.; 36m., 26th, 

 N.S W.: 39m., 31st, W. 



