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BULLETIN No. 433. 



JANUARY. 1925 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGIIICULTUIUL EXPERIMENT 



STATION. 



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



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

 Height oj Wind Instruments J2 ft. Time used, 'j^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing 

 Minimum reduced to freezing 

 Reduced niaxinuim reading. 

 Reduced minimum reading 



30.43, ist, 8 A. 

 28.88, 30th 4 A. 

 30.76. ist, 8 A. 

 29.19, 3otli,8 A. 



Mean semi-daily reduced 30.204 



Monthly range 1.57 



Air Temperature. 



In Degrees Fahr. 



Highest 41.5, 8th, II A. 



Lowest -13.0, 29th 4 .\. 



Mean hourly 20.9 



Mean of means of max. and min 21. i 



Mean sensible (wet bulb) 17.7 



Monthly range 54.5 



Highest mean daily 37.0, 8th 



Lowest mean daily o.i, 24th 



Mean maximum 30.5 



Mean minimum ri.8 



Mean daily range 18.7 



Greatest daily range 38.0,29th 



Least daily range 8,0, 6th, 30th 



Humidity. 



Mean dew point 13.8 



Mean force of vapor 144 



Mean relative humidity 81.5 



Precipitation. In inches. 



Total precipitation, in inches 3.42 



Total snow, in inches 22.0 



Number of days on which .01 inch or more 



rain fell 8 



Days of sli'ighing 20 



Wind. 



Total movement 5688m 



Greatest daily movement 406m, 23d 



Least daily movement 24m,i6th 



Mean daily movement i83ni 



Mean hourly velocity 7.6m 



Maximum pressure per sciuare foot, 14.0 lbs = 



52m per hour, 22d, 8 r., N.N.W. 

 Maximum velocity for 5 minutes, 27m per 



hour, 22d, 10 P., N.N.W. 

 Prevailing direction, N.N.W. 

 Summary. 



North Northeast 23 per cent 



North 19 '■ " 



North Northwest 16 " " 



Northwest 10 " " 



West Northwest 10 " " 



Other directions 22" " 



Weather. 



Mean cloudiness observed .... 51 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 173 hours = 58 per cent. 



Number of clear days 6 



Number of fair days 9 



Number of cloudy days 16 



Briiiht Sunshine. 

 Number hours recorded, 124 = 42 per cent. 

 Rain. 3d, 13th. i6th, 27th, 

 Snow. 2d, 3d, 4th, 6th, 12th, 13th, i6th, i8th, 



20th, 27th, 29th, 30th. 

 Gales. 47m, 13th, 10 P., N.W.; 4oni, 14th. 9 P. 

 N.: 52m, 22d, 8 P., N.N.W.: 39111. 23d, 2-30 

 A.. N.N.W.; 39ni., 27th, 5 p.. N.N.E.; 47m, 

 28th, 4 A., N.N.E.; 46m, 30th, 12 M., N.W. 



