BULLETIN No. 264. 



DECEMBER, 1910 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height 0/ barometer above ground, 51 ft. Above sea level, 213.^ ft. 

 Height of Wi?ul Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30 45, 31st, 10 A. 

 Minimum reduced to freezing, 29.03, 15th, 6 p.; 



20th, 2 P. 

 Reducedt maximum reading, 30.78, 31st, 10 A. 

 Reducedt minimum reading,i 29.34, iS^h, 6?.; 



20th, 2 P. 



Mean semi-daily reduced, 30-030 



Monthly range, 1.44 



*Air Temperature. In Degrees Fahr. 



Highest 47.0,24th, 9A. 



Lowest, -2.0, loth, 7:30 A. 



Mean hourly, 21.7 



Mean of means of max. and min., .... 21.9 



Mean sensible (wet bulb), 1S.7 



Monthly range, 49-o 



Highest mean daily 37-7, 24th 



Lowest mean daily, 5-6, i6th 



Mean maximum, 35-8 



Mean minimum, i3-i 



Mean daily range, 22.7 



Greatest daily range 38-5. 3oth 



Least daily range, /• • 5-5>6th 



Humidity. 



Mean dew point, 142 



Mean force of vapor, ii9 



Mean relative humidity, 78.4 



Precipitation. In inches. 



Total precipitation, 1.72 



Number of days on which .01 inch or more 



rain fell, 7 



Total snow in inches 2.5 



♦Temperature in ground shelter. 

 Reduced to freezing and sea-level. 



Wind. 



Total movement, 5435"! 



Greatest daily movement, .... 407m., 30th 

 Least daily movement, . . . 48m., 27th, 28th 



Mean daily movement i75.o m 



Mean hourly velocity, 7-3 m 



Maximum pressure per square foot, 10.5 lbs.= 



46m. per hour, 15th, 8 P., N. 

 Maximum velocity for 5 minutes, 42m. per 



hour 30th, 4 p., N.W. 

 Prevailing Direction, Northwest. 

 Summary. 



Northwest 26 percent. 



North Northwest 16 



North 10 



West Northwest 10 



West 13 



Other directions 25 



Weather. 



Mean cloudiness observed, .... 55 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i27hrs.=45 per cent. 



Number of clear days, 8 



Number of fair days, i3 



Number of cloudy days, 10 



Bright Sunshine. 



Number of hours recorded, . . 156 hrs. = 5S!( 



Bain, i8th, 19th, 23d, 24th, 29th, 30th. 



Snow, nth, 15th, i8th, 19th, 20th, 21st, 26th, 



28th. 



Days Sleighing, None. 



Gales, 35 or more miles per hour : 46m, 15th, 



N..; 36m, i6th, N.N.W.; 37m, 24th, S.S.W.; 



45m, 30th, N. W. 



