BULLETIN No. 336. 



DECEMBER, 19 16 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATIOIN. 



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



Height of barometer above ground, ^r ft. Above sea level, 2jj.j ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30,15, 26th, 3 p 

 Minimum reduced to freezing, 2S.65, 22d, 2 p 

 Reducedt maximum reading, 30.47, 26tii, 3 p 

 Reducedt minimum reading, 28.96, 22d, 2 p 



Mean semi-daily reduced 29.932 



Monthly range 1.51 



*Air Temperature. In Degrees Fahr. 



Highest 54,5, sth, 3 p 



Lowest 0.0, 31st, 6 A 



Mean hourly 26.5 



Mean of means of max. and min 26.5 



Mean sensible (wet bulb) 24.0 



Monthly range 54 



Highest mean daily 47.5, 5th 



Lowest mean daily 10.4, 30th 



Mean maximum 33.7 



Mean minimum 19.5 



Mean daily range 14.2 



Greatest daily range 24.5, 18th 



Least daily range 3.0, 23d 



Humidity. 



Mean dew point 20 



Mean force of vapor 149 



Mean relative humidity 81.7 



Precipitation. In inches. 



Total precipitation, in inches 2.85 



Total snow, in inches 9^ 



Number of days on which .01 inch or more 



rain fell 10 



Days of Sleii^hing 20 



■'Temperature in ground shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 4026 m 



Greatest daily movement .387m, 23d 



Least daily movement om, 4th 



Mean daily movement 130 m 



Mean hourly velocity 5-4 ni 



Maximum pressure per square foot, 15.5 lbs = 



56m per hour, 22d, 12 p, W.N.W. 

 Maximum velocity for 5 minutes 32m per 



hour, 22d, 9P, W N.W. 

 Prevailing direction. West Northwest. 



Summary. 



North Northwest 16 per cent 



West 13 " 



North 10 " 



Northwest 19 " 



West Northwest 23 " 



Other directions iq " 



Weather. 



Mean cloudiness observed .... 53 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .156 hours = 55 per cent 



Number of clear days 6 



Number of fair days u 



Number of cloudy days 14 



Bright Sunshine. 



Number hours recorded, 127 hrs, = 45 per cent 

 Rain. 4tli, 5th, 9th, 22d, 27th, 2Sth. 

 Snow, nth, 12th, 15th, 2ist, 25th, 2Sth. 

 Hail. 27th, 28th. 

 Gales, 35 or more miles per hour. 45m, 6th, 



N.N W.; 35m, i2th, W.N.W.; 39m, 13th, 



W.N.W.; 43m,i6th,N.W.: 56m,22d.W.N. W.; 



45m, 25th, W.N. W.: 37m, 2Sth, W.N.W.; 



35m. 2gth. W.N.W. 



