BULLETIN No. 275. 



NOVEMBER, 1911 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGKICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 fi- Above sea level , 2yj.^ ft. 

 Height of Wind Listruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.17. 4th, g A. 

 Minimum reduced to freezing, 28.93, i8th, 12 M. 

 Reducedt nifiximum reading, 30.48, 4th, 9 A. 

 Reducedt minimum reading, 29.24, i8th, 12 M. 



Mean semi-daily reduced, 30.009 



Monthly range 1.24 



*Air Temperature. In Degrees Fahr. 



Highest, 66.5, 12th, 2 P 



Lowest, 18.5, 23d, 7 A 



Mean hourly, 36-7 



Mean of means of max. and min., .... 37.2 



Mean sensible (wet bulb), 32-3 



Monthly range 48.0 



Highest mean daily, 55-4. 12th 



Lowest mean daily, 28.3, 22d 



Mean maximum. 46-0 



Mean minimum, .... 2S.4 



Mean daily range, i7-6 



Greatest daily range 34-o. 12th 



Least daily range, 4-o. loth 



Humidity. 



"Mean dew point, . . . • 

 Mean force of vapor, . . 

 Mean relative humidity. 



27.4 

 .214 



73-5 



Precipitation. In inches. 



Total precipitation 3-84 



Number of days on which .01 inch or more 



rain fell, ' '2 



Total snow in inches i-O 



Wind. 



Total movement, 5950m 



Greatest daily movement, .... 477m., 12th 



Least daily movement, 60m., 5th 



Mean daily movement, 198.0 m 



Mean hourly velocity, 8.3 m 



Maximum pressure per square foot, 15.0 lbs.= 



55m. per hour, 12th, 6 p., S.W. 

 Maximum velocity for 5 minutes, 36m. per 



hour, 12th, 2P., S.W. 

 Prevailing Direction, West. 



Summary. 



West Northwest 13 percent. 



Northwest 13" 



West Southwest 10 " " 



Southwest 10 " 



South Southwest 20 " " 



Northeast 10 " 



Other directions 24 " " 



Weather. 



Mean cloudiness observed, . . . . 6o per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 2i9hrs.=75 per cent. 



Number of clear days, i 



Number of fair days, 9 



Number of cloudy days, 20 



Bright Sunshine. 



Number of hours recorded. . . 74 hrs.=25^ 

 Rain, ist, 6th, 7th, 9th, loth, 12th, 14th, 15th, 

 iSth, 20th, 24th, 28th. 

 Snow, 14th, 15th, 16th, i8th, 20th, 21st. 

 Gales, 35 or more miles per hour : 40 m, 2d, 

 N.N.W.; 39m. 7th, W.S.W.: 55 m, 12th, S.W.; 

 41 m, 13th, W.N.W.: 36 m, i6th, N.W. 



Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



