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AMHEB8T. MASS. 



BULLETIN No. 444. 



DECEMBER 1925 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTUML EXrEIIIMENT 



STATIOIN. 



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



Hei^:;ht of barometer above groutid^ 5^ f^- Above sea level, 2yj.^ ft. 

 Height oj IVimi Itistruments 72 ft. Time used, y^t/i Mer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.iv ist.oA. 

 Minimum reduced to freezing, 24.05, 12th, 7 A 



13th 2 A 

 Reduced ma.ximum reading, 30.47, ist,0A. 

 Reduced minimum reading, 29.36, 12th, 7 A. 



i3tli 2 A 



Mean semi-daily reduced 29.899 



Monthly range i.ii 



Air Temperature. 



In Degrees Fahr. 



Highest 56.5,6th. 4.30 A 



Lowest 1.5, 27th, 7 A.: 30th, 7 A 



Mean hourly , . 28.7 



Mean of means of max. and min 29.0 



Mean sensible (wet bulb) 26.1 



Monthly range 55-o 



Highest mean daily 45. 8, 6th 



Lowest mean daily 6.0, 27th 



Mean maximum 35-4 



Mean minimum 22.6 



Mean daily range 12.8 



Greatest daily range 28.0, 30th 



Least daily range 5.0, 21st 



Humidity. 



Mean dew point 22.2 



Mean force of vapor 163 



Mean relative humidity 79. 9 



Precipitation. In inches. 



Total precipitation, in inches 3.56 



Total snow, in inches, 6ii 



Number of days on which .01 inch or more 



rain fell if 



Days of sleighing, 2 



Wind. 



Total movement 6694m 



Greatest daily movement 441 ni, 9th 



Least daily movement 81m, 16th 



Mean daily movement 216 m 



Mean hourly velocity g.om 



Maximum pressure per square foot, 14.0 lbs = 



53m per hour, 9th, 10 A., \V. 

 .Maximum velocity for 5 minutes, 36m per 



hour, 9th, 10 A., W. 

 Prevailing direction, West Northwest. 

 Summary. 



Northwest 19 per cent 



West 19 " " 



Southwest 13 " " 



West Northwest jo " " 



South Southwest 10 " " 



North 10 " " 



North Northeast, 10 '" " 



Other directions 9 " " 



Weather. 



Mean cloudiness observed .... 56 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 162 hours = 5"' per cent 



Number of clear days 4 



Number of fair days 13 



Number of cloudy days 14 



Ilriiibt Sunshine. 



Number hours recorded. 121 — 43 per cent. 

 Rain, 3d, 4th, 5th, 6th, Sth, nth, 12th, 20th. 



2ISt, 22d. 



Snow, ist, 22d, 24tli, 25th. 



Gales, 53m, 9th, W.: 36m, 10th, W. N. W.; 



40m, i2th, N. W.; 38m, 13th, N. W.: 



43m, 14th, N. W.: 36m, 17th, N. W. 



39m, 23d, N. W.; 36m, 26th, N. W.; 



42m, 27th, N. W.: 37m. 28th, N. N.W.: 



36m, 2gth, N. W. 



