BULLETIN No. 468. 



DECEMBER, 1927 



iMeteoroloo'ical Observations 



AT THK 



MASSACHUSETTS 



AGRICULTUIUL EXPEKIMENT 



STATION. 



Latitude, 42" 23' 48.5" N. Longitude 72' 31' xo" \V. 



Height of barometer aboi'e ground, ^i ft. Above sea level, 2jj.^ ft. 

 Height oj IVimi Instrumefits Y2ft. Titne used, j^thMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, So. 43, 4th, Sa. 

 Minimum reduced tofreeziuR, 28.S1, i6tli,9P- 

 Reduced maximum reading, 30.76, 4tli, 8 a. 

 Reduced minimum reading, 29.12, i6th, 9 p 



Mean semi-daily reduced 30.041 



Monthly range 1.64 



Air Temperature. 



In Degrees Fahr. 



Highest . . ., 61.5, ist, 2 a. 



Lowest 8.5, 27th, 7:30 A. 



Mean hourly 29.5 



Mean of means of max. and min 29.7 



Mean sensible (wet bulb) 27.0 



Monthly range 530 



Highest mean daily 45.2, 8th 



Lowest mean daily 15.5, 24th 



Mean maximum 37.4 



Mean minimum 21.9 



Mean daily range 15.; 



Greatest daily range 36.0,8th 



Least daily range 5.5,13th 



Humidity. 



Mean dew point 23.1 



Mean force of vapor 165 



Mean relative humidity 81.3 



Hrecifiitation. In inches. 



Total precipitation, in inches 5.65 



Number of days on which .01 inch or more 



rain fell 11 



Total snow in inches 3i 



Wind. 



Total movement 5546m 



Greatest daily movement 38oni, 1st 



Least daily movement . . . . 22m, 7th. 31st 



Mean daily movement i7gm 



Mean hourly velocity 7.5m 



Maximum pressure per square foot, 13.0 lbs = 



51m per hour, 8th, 8 A. S.S.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 8th, 8a., S.S.W. 

 Prevailing direction. West Northwest 

 Summary. 



West 19 per cent 



North 13 ' 



North Northwest 13 " 



North Northeast 10 ' 



.South Southwest 10 " 



West Northwest 10 " 



Northwest 10 '" 



Other directions 15 ' 



Weather. 

 Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the S^un 



Thermometer . . 183 hours = 65 per cent 



Number of clear days 3 



Number of fair days 11 



Number f)f cloudy days 17 



Rriiiht Sunshine. 

 Number hours recorded. 100 =r 35 per cent. 



Rain. 2d, 4th, 5th, 7th, 8th, nth, 13th, 14th, 



i6th, 23rd, 29th, 31st. 

 Snow, 2d. 4th, 5th, nth, 13th, i6th, 23d. 

 Gales, 45m, ist, N.W.: 47m, 4th: N.; 51m, 8th, 



S.S.W.: 35m, 14th. N.W.: 45m. 16th, 



N.W. 



