BULLETIN No. 228. 



DECEMBER, 1907. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPERIMENT 



STATION. 



Latitude, 42" 23' 48.5" N. 



Longitude 72° 31' 10" W. 



Height of barometer above ground, 31 ft. Above sea level, ^73-5 P- 

 Height of Wind histrunients 72 ft. 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maximum reduced to freezing, 30.13. 21st, 10 p. 

 Minimum reduced to freezing, 28.74, 23d, 10 p. 

 Reducedt maximum reading, 3o-45, zist, 10 p. 

 Keducedt minimum reading, 29.05, 23d, 10 P. 



Mean semi-daily reduced, 3o-025 



Monthly range, 1.40 



* Alt' Temperature. In Degrees Falir. 



Highest ; • • 60.5,10th, 9 A 



Lowest, 10. o, 20th, 7 A. 



Mean iiourly, 3o.5 



Mean of means of max. and min 31.2 



Mean sensible (wet bulb), 27.5 



Monthly range 5o-5 



Higliest mean daily 53.2,10th 



Lowest mean daily 21.0, 5th 



Mean maximum 39-o 



• Mean minimum 23.3 



Mean daily range, 15.7 



Greatest daily range, 31.5, 9th 



Least daily range, 6.0,4th 



Htnaiditj/. 



Mean dew point 23.7 



Mean force of vapor, 177 



Mean relative humidity 80.4 



Precipitation. In inches. 



Total precipitation, 3.S9 



N'umber of days on which .01 inch or more 



rain or melted snow fell, 9 



Total snow, in inches, 7.5 



• Temperature in ground shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5266ni. 



Greatest daily movement, . . . . 4i9ni., loth 



Least daily movement, iSm., 8th 



Mean daily movement, 173 m. 



Mean hourly velocity, 7.2 m. 



Maximum pressure per square foot, 18.5 lbs.= 



61 m. per hour, loth, 12M., S. S. E. 

 Maximum velocity for 5 minutes, 42 m. per 



hour loth, lOA., S. S. E. 

 Prevailing Direction, West. 

 Summary. 



West, 19 per cent. 



Southwest, 10 " " 



South 16 " " 



Northwest 10 " " 



North Northwest • 10 " " 



West Southwest 13 " " 



Other directions 22 " " 



JVeatlier. 

 Mean cloudiness observed, . ... 51 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 161 hrs.=57 per cent. 



Number of clear days, 6 



Number of fair days, 13 



Number of cloudy days, . . 12 



Rriglit S tin shine. 

 Number of hours recorded. . . 122 hrs. = 43< 

 Rain, loth, i6th, 23d. 25th, 28th, 30th. 

 Snoiv, 2d, 4th. 14th, 15th, i6tli, 25th, 31st. 

 Sleet, 14th. 



DaifS Sleighing, 9 



Oales, 35 miles or more per hour, 36 m., 5th. 

 N.; 61m., loth, S.S.E., 37m., 12th, W.; 40 

 m., 14th. N.N.E.; 42 m. 24th, W.; 5oni. 

 31st, N. W. 



