BULLETIN No. 432. 



DECEMBER, 1924 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, J/.//. Above sea levels ^73-5 fi' 

 Height oj Wind Instru7nents y2 ft. Time used, y^t/iMer. 



MONTHLY SUMMARY. 



I'ressiite. In inches. 



Maximum reduced to freezing, 30.27, 26th, ro A. 

 Minimum reduced to freezino;, 28.88, .13th 7 p. 

 Reduced maximum reading, 30.59, 26th, 10 A. 

 Reduced minimum reading, 29.19, 13th, 7 p. 



Mean semi-daily reduced 30134 



Monthly range 1.40 



Air Temperature. 



In Degrees Fahr. 



Highest 5S.0, 9th,io:3o A. 



Lowest -i.o, 2ith 7 A.; 22d, 6 .a. 



.Mean hourly 25.7 



Mean fif means of max. and min 25.6 



Mean sensiljle (wet bulb) 21.8 



Monthly range 59.0 



Highest mean daily 45.8, 9th 



Lowest mean daily 6.0, 21st 



Mean maximum 33.9 



Mean minimum 17.3 



Mean daily range 16.6 



Greatest daily range 29.0, 5th 



Least daily range 4.0, i8th 



Hnmidily. 



Mean dew point 16.3 



Mean force of vapor 139 



Mean relative luimidity 74.6 



Precipitation. In inches. 



Total precipitation, in inches 2.16 



Total snow, in inches 3.0 



Number of days on which .01 inch or more 



rain fell i 



Days of sleighing 6 



Wind. 



Total movement 4597n'i 



Greatest daily movement 418m, 14th 



Least daily movement 22ni,i2th 



Mean daily movement 148m 



.Mean hourly velocity 6.2m 



Maximum pressure per square foot, 11. lbs = 



47m per hour, 20th, 12 p., N.W. 

 .Maximum velocity for ; minutes, 30m per 



hour, rgth, 10 p., N.W. 

 Prevailing direction, West. 

 Summary. 



Northwest 19 per cent 



North Northeast 10 " " 



West Northwest 10 " " 



West 13 " " 



South Southwest 16 " " 



South 10 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed .... 57 per cent 

 Total cloudiness rect)rded by the Sun 



Thermometer . . 163 hours = 58 per cent. 



Number of clear days 4 



Number of fair days 13 



Number of cloudy days 14 



Kriiiht Sunshine. 



Number hours recorded, 120 =42 per cent. 

 Rain. 5th, 6th, 8th, 9th, 13th. 17th, i8th, 19th, 



24th. 

 Snow. 5th, i2th, 13th, 14th, 22d, 23d, 24th. 

 Gales. 44m, 9th, W.N.W.; 35m, loth. N.W.: 



35m, 13th, S.W.; 45m, 14th, W.N.W.; 42m, 

 15th, N.W.; 45m. 19th, N.W.; 47ni. 20th, 



N.W.: 4ini, 21st, N.W. 



