BULLETIN No. 243. 



MARCH, 1909. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, ^73-5 f- 

 Height of Wind Ifistruments 72 ft. 



MONTHLY SUMMARY. 



Fregsiire. In inches. 



Maximum reduced to freezing, 30 04, 12th, 7 a. 

 Minimum reduced to freezing, 28.54, 25th, 10 p. 

 Reduced! maximum reading, 30.36, 12th, 7 A 

 Reducedt minimum reading, 28.84, 25th, 10 p. 



Mean semi-daily reduced, 29.823 



Monthly range 1.52 



*Air Temperature. In Degrees Fahr. 



Highest, 54.0, 24th, 4:30? ; 27th 2 P. 



Lowest 13-0. ist, 7 A. 



Mean hourly, 32.4 



Mean of means of max. and min 33.2|West Southwest ig " 



Mean sensible (wet bulb), 29.5 Northwest 16 



Wind. 



Total movement, 7034ni. 



Greatest daily movement, . . . 461 ni., 5th. 



Least daily movement, 37111., loth. 



Mean daily movement 227m. 



Mean hourly velocity, 9-5 m. 



Maximum pressure per square foot, i8.olbs.= 



60m. per hour, 25th, 2P., SE. 

 Maximum velocity for 5 minutes, 45m. per 



hour 25th, 2 P., SK. 

 Prevailing Direction, North Northwest. 



Summary. 

 North Northwest 26 percent 



Monthly range, 41.0 



Highest mean daily, 41.0, 31st 



Lowest mean daily, 21.0, 5th 



Mean maximum, 4i-5 



Mean minimum, 25.0 



Mean daily range, 16.5 



Greatest daily range, 31.0, 24th 



Least daily range, 6.0, 5th 



Htimidity. 



Mean dew point, 26.0 



Mean force of vapor, '. .180 



Mean relative humidity, 81.3 



Precipitation. In inches. 



Total precipitation, 3.01 



Number of days on which .01 inch or more 



rain or melted snow fell, . • 12 



Total snow in inches, 3.5 



North 16 " " 



North Northeast 13 " " 



Other directions, 10 " " 



Weather. 

 Mean cloudiness observed, . . . .49 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, ... i39hrs.= 37per cent. 



Number of clear days, 12 



Number of fair days, 11 



Number of cloudy days, 8 



Bright Sttnshine. 

 Number of hours recorded, . . 232 lirs.=635f 



Rain, 2d, 9th, loth, 25th, 27th. 



Thunder and Lightnin;;, none. 



Snow, 2d, 3d, 4th, 7th, iith, 13th, 14th, i6th, 



17th, iSth, 19th, 26th, 2Sth, 30th. 

 Days Sleighing, o 



Gales, 35 miles or more per honr ; 41m., 

 5th., N.N.W.; 57m., nth, N.; 35m., 12th, 

 N.; 35m., 17th., N. N. W.; 38111., 20th, 

 N.E. ; 36m, 22d, N.E.; 60m, 25th. S.E.; 

 35m, 27th, S.W.; 35m, 29th, N.N.W.: 36m. 

 3ist, N.N.W. 



• Temperature in ground slielter. 

 t Reduced to freezing and sea-level. 



