BULLETIN No. 408. 



DECEMBER, 1922 



Meteorolooical Observations 



o 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



ffe/^^ht of barometer above ground, ^t ft. Above sealevel, 2jj.^ ft. 

 Height of IVind Instrufnents y2 ft. Titne used, y^tliMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maxiniinn reduced to freezing, 30.36, nth, 9A 

 Mininiiiin reduced to freezing, 29.35, 29th. lA 

 Reduced maximum reading 30,69 nth, 9A 

 Reduced minimum reading, 29.67, 29th, lA 



Mean semi-daily reduced 30.151 



Montlily range 1.02 



Air Temperature. 



In Degrees Fahr. 



Highest 54.0, ist, 4P 



Lowest -65, 20th, 7A 



Mean hourly 24,7 



Mean of means of max. and min 25.1 



Mean sensible (wet bulb) 22.2 



Monthly range 60.5 



Highest mean daily 46.7, ist 



Lowest mean daily 6.1,20th 



Mean maximum 33.6 



Mean minimum 16.5 



Mean daily range 17.1 



Greatest daily range 35.0, 31st 



Least daily range S.o, 17th 



Hamidity. 



Mean dew point 1S.3 



Mean force of vapor 139 



Mean relative humidity 81. 8 



Precipitation. In inches. 



Total precipitation, in inches 315 



Total snow, in inches iS.; 



Number of days on which .01 inch or more 



rain fell 10 



Days of sleighing 18 



•Temperature in ground shelter. 

 "Reduced t6 freezingand sea-level. 



Wina. 



Total movement 4256 m 



Greatest daily movement 467m, 6th 



Least daily movement 34m, 20th 



Mean daily movement 137m 



Mean hourly velocity 5.7m 



Maximum pressure per square foot, 16.5 lbs = 



57m per hour, 29th, lA., N. 

 Maximum velocity for 5 minutes, 36 m per 



hour, 29th, OA., N. 

 Prevailing direction. West. 



Summary. 



North 13 per cent 



Northwest 16 " 



South, Southwest 16 " 



Southwest 13 " 



North Northwest 10 " 



Other directions 32 " 



Weather. 



Mean cloudiness observed .... 54 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 197 hours = 70 per cent. 



Number of clear days 2 



Number of fair days 10 



Number of cloudy days 19 



Bright Sunshine. 



Number hours recorded, 86 = 30 per cent. 



Rain, 5th, 8th, 12th, 15th, 17th. 



Snow. 3d, 5th, 7th, 8th, 12th, 14th, 17th, 20th, 



2ist, 28th, 2gth. 

 Sleet. Sth, 28th. 

 Gales, 35 or more miles per hour, 37m, 2d, 



N.W.; 42m, 5th, N.W.; 49ni, 6th, N.W.; 



49m, i2th, N.W.; 35m, 13th, W.N.W.; 



46m, 28th, N.N.E.: 57m. 29th, N. 



