BULLETIN No. 287. 



NOVEMBER, 1912 



Meteorolodcal Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, ^i ft. Above sea level, 2yj.^ ft. 

 Height of Wiful Instrutne/its 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



M.ixumiin reduced to freezing, 30 19. 3cth, 12 p. 

 Minimum reduced to freezing, 29,03, 24th, iop. 

 Reducedt maximum reading, 30. 50, 3oht, 12 P. 

 Reducedt i^iinimuni reading, 29.33, 24th, iop. 



Mean semi-daily reduced, 29.997 



Montlily range 1.17 



*/Vir Temperature, In Degrees Fahr. 



Higliest 67.0. 6th, 3 p. 



Lowest 18.5, 29th, 6 A. 



Mean hourly, 40.0 



Mean of means of max. and min 40.5 



Mean sensible (wet bulb), 356 



Montlily range 4S.5 



Highest mean daily, 61.2,7th 



r^owest mean daily, 29.4, 29th 



.Mean maximum 49-8 



Mean minimum, 3i-2 



Mean daily range 1S.6 



Greatest daily range 33.5,21st 



Least daily range, 5-°. 25th 



Humidity. 



Mean dew point, 3i-6 



Mean force of vapor 244 



Mean relative humidity, 77.2 



Precipitation. In inches. 



Total precipitation, 403 



Number of days on which .01 inch or more 



rain fell -6 



Total snow in inches Trace 



Wind. 



Total movement, 5037m. 



Greatest daily movement, .... 42oni., 25th 



Least daily movement, 32ni., nth 



Mean daily movement, 168 m 



Mean hourly velocity, 7.0 m 



Maximum pressure per square foot, j8.olbs.= 



6om. per hour, 24th, 4 p., E.N.E. 

 Ma.ximum velocity for 5 minutes, 40 m. per 



hour, 24th, 4 p., E.N.E. 

 Prevailing Direction, West Southwest. 



Summary. 



South Southwast 20 per cent 



Northwest 17 



West Southwest 13 



West 10 



Southwest 10 



Other directions 30 



Weather. 



Mean cloudiness observed, .... 51 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, .... 147 hrs. = 50 per cent. 



Number of clear days 4 



Number of fair days, 16 



Number of cloudy days, 10 



Bright .Sunshine. 



Number of hours recorded, . . 146 hrs. = 50* 



Rain, ist, 7th, Sth, 13th, 14th,' 24th. 



Snow, 3d, 15th, i8th, 25th, 28th. 



Hail, 24th. 



Gales, 35 or more miles per hour : 40 m, ist, 



S.W.; 36 m , 7th, S.S.W.; 60 m., 24th, E.N,E.; 



j6 m., 25th, W\; 35 m., 30th, W. 



♦Temperature in ground shelter. 

 Keduced to freezing and sea-level. 



