BULLETIN No. 309. 



SEPTEMBER, 1914 



Meteorological Observations 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 fi' Above sea level, ^YS-S f^' 

 Height of IVind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30 23, 14th, 9 A. 

 Minimum reduced to freezing, 29,41, 24th, 3 p. 

 Reduced! maximum reading, 30.53, 14th, 9 A. 

 Reduced! minimum reading, 29.69, 24th, 3 P. 



Mean semi-daily reduced, 3o-i3i 



Monthly range 0.S4 



*Air Temperature. In Degrees Fahr. 



Higliest 96.5, 22d, 3:30 P 



Lowest, 24.5, 29tli, 6 a 



Mean hourly, 60.2 



Mean of means of max. and min 61.0 



Mean sensible (wet bulb), 53.1 



Monthly range, - 72.0 



Highest mean daily, 78.7, 2d 



Lowest mean daily 42.0, 28th 



Mean maximum 75.6 



Mean minimum, 46.3 



Mean daily range, 29.3 



Greatest daily range, 44-5. 22d 



Least daily range, i3-o, 25th 



Humidity. 



Mean dew point, 48.9 



Mean force of vapor 503 



Mean relative humidity, ....... .74.3 



Precipitation. In inches. 



Total precipitation, 52 



Number of days on which .01 inch or more 



rain fell 6 



♦Temperature in ground shelter. 

 1 Reduced to freezing and sea-level. 



Wind. 



Total movement, 2992111. 



Greatest daily movement, .... 266m., 26th 



Least daily movement, 22m., 22d 



Mean daily movement, 100 m 



Mean hourly velocity, 4.2 m 



Maximum pressure per square foot, ii.olbs.= 



47m. per hour, 28th, 10 A., N.N.E. 

 Maximum velocity for 5 minutes, 30m. per 



hour, 28th, 10 A., N.N.E. 

 Prevailing Direction, North. 



Summary. 



North Northeast 20 per cent. 



North • • 13 " " 



Southwest • 13 " " 



East Southeast 10 " " 



Other directions 44 " " 



Weatlier. 



Mean cloudiness observed, .... 27 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i27hrs.=34 per cent. 



Number of clear days, 12 



Number of fair days, 13 



Number of cloudy days, 5 



Bright Sunshine. 



Number of hours recorded, . . 246 lirs=66^. 

 Rain, 3d, 6th, 24th, 25th, 27th, 28th, 29th, 



30th. 

 Frosts, 28th, 29th. 



Tlmnder and Liglitning:, 2d, 3d, 30th. 

 Hail, 28th. 

 Gales, 35 or more miles per hour: 36m, 7th, 



\V.N.W.;36m, 26th, N.: 47m, 28th,N.N;E. 



