BULLETIN No. 267. 



MARCH, 1911 



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, 2yj.^ ft. 

 Height of Wind Ifistrionents 72 ft. 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maxinuun reduced to freezing, 30 40, 7th, 10 A. 

 Miniimini reduced to freezing, 28.64,30th, 6 A. 

 Reduced! maximum reading, 30.72, 7th, 10 A. 

 Reducedt minimum reading, 28.95, 3oth, 6 A. 



Mean semi-daily reduced 29.985 



Monthly range, 1.77 



*Air Temperature. In Degrees Fahr. 



Higliest 59.0, 26th, 4:00 P. 



Lowest, 2.5, 7th, 7:30 A. 



Mean hourly, 31.5 



Mean of means of ma.\. and min 31.7 



Mean sensible (wet bulb) 27.6 



Monthly range, 56.5 



Highest mean daily, 46.5,27th. 



Lowest mean daily, i5-0i i6th 



Mean maximum 42-o 



Mean minimum, 21.5 



Mean daily range 20.5 



Greatest daily range, 44-o, 26th 



Least daily range 7-o. S'st 



Hninidity. 



Mean dew point 22.2 



Mean force of vapor 175 



Mean relative humidity, 73-2 



Precipitation. In inches. 



Total precipitation, 3. So 



Number of days on which .01 inch or more 



rain fell, • 11 



Total snnw in inches 10.5 



♦Temperature in ground shelter. 

 tKeduced to freezing and sea-level. 



Wind. 



Total movement, 7485m 



Greatest daily movement, . . . . 605m., i6th 



Least daily movement 6gm., 9th 



Mean daily movement, 241 m 



Mean hourly velocity, 10 m 



Ma.ximum pressure per square foot, 21.0 lbs. = 

 65m. per hour, i6th, 9 A., W.N.W. 



Maximum velocity for 5 minutes, 44m. per 



hour i6th, 9:30 P., W.N.W. 

 Prevailing Direction, West. 



Summary. 



West • 13 per cent. 



West Southwest 23 " " 



Northwest 16 " " 



South Southwest 10 " " 



South 10 " " 



Other directions 28 " " 



Weather. 



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

 Total cloudiness recorded by the Sun Ther- 

 mometer. 135 hrs.=36 per cent. 



Number of clear days, 15 



Number of fair days, 9 



Number of cloudy days, 7 



Briglit Suiisliiiie. 

 Number of hours recorded, . . 236 hrs. = 64^ 



Rain, 3d, 12th, 15th, i8th, 20th, 22d, 27th, 

 29th, 30th. 



Snow 2d, 3d, 6th, loth, 15th, i6th, 19th, 20th, 

 2ist, 31st. 



Sleet, 15th, iSth. 



Hail, 27th. 



Days Sleighing, none. 



Tlinnrter and Lightning, 27th, 29th. 



Gales, 35 or more miles per hour : 42m, i;th, 

 W.N.W.; 65m, i6th, W.N.W ; 35m, 20th, 

 W.N.W.; 36m, 2ist, W.N.W.: 4ini. 22d, 

 W.N.W.; 41m. 23d, W.N.W.; 42m, 28th, 

 W.; 35m, 31st W. 



