METEOROLOGICAL OBSERVATORY 



OF thp: 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, Ji ft. Above sea level, 2yj.j ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 207. 



MARCH, 1906. 



MONTHLY SUMMARY. 



Preasiire, In inches. 



Maxiinuni reduced to freezing, 30.59. 24tli, 8 A 

 .\Iininuini reduced to. freezing, 28.98,9111,4?. 

 Reducedt maximum reading, 30.92, 24th, 8 A. 

 Iteducedt minimum reading, 29.28, 9th, 4 p. 



Mean semi-daily reduced, 30.090 



Monthly range 1.64 



*Air Temperature. In Degrees Falir. 



Highest 530, 29th, 3 p. 



Lowest —7.5,24th, 7 A. 



Mean hourly, 2S.3 



Mean of means of max. and min 28.0 



Mean sensible (wet bulb), 25.3 



Monthly range, 60.5 



Highest mean daily, 41.3,28th 



Lowest mean daily, 11.5,24th 



Mean maximum, 37.0 



Mean minimum, 18.9 



Mean daily range, 18. i 



Greatest daily range 47.5. 25th 



Least daily range, 4.5,30th 



Hituiidity. 



Mean dew point, i9-3 



Mean force of vapor, 15S 



Mean relative humidity, 73.9 



yrecipitntioH. In inches. 



Total precipitation, 4-9o 



Number of days on which .01 inch or more 



rain or melted snow fell, u 



Total snow in inches 204 



Snow on ground at end of montii, . . . trace 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Uind. 



Total movement, 5686111. 



Greatest daily movement 471 m., 1st 



Least daily movement, iS m., 25th 



Mean daily movement, 183 m. 



Mean hourly velocity, 7.6 m. 



Maximum pressure per square foot, 7.0 lbs.= 



37 m. per hour, loth, ii A., N.W. 

 Maximum velocity for 5 minutes, 30 m. per 



hour 22d, 7 A., N. W. 

 Prevailing Direction, North, Northwest. 



Suniniary. 



North, Northwest, 13 percent. 



North, 13 " 



North, Northeast, 16 " 



Northeast, 10 " 



Northwest • . . 23 " 



Other directions, 25 " 



Weather. 



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

 Total cloudiness recorded by the Sun Ther- 

 mometer, . ... 146 hrs. =39 per cent. 



Number of clear days, 11 



Number of fair days 13 



Number of cloudy days 7 



Bright S>€nshine, 



Number of hours recorded, . . 225 hrs.=6nl 



Rain, 3d,4th,26tli, 27th, 30th, 31st. 



Gales, 2i miles or more per hour, 37 m. lotli, 

 N.W.: 35m. 20th, N.W. ; 36m. 22d. N.W. 



Snou\ 3d, Sth. 12th, 14th, 15th, 19th, 20th, 



22d, 31st. 



Days of Sleighing, 13 



