METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 31 ft. Above sea level, 2^3.3 ft. 

 Height of Wind Instruments "J 2 ft. 



BULLETIN No. 196. APRIL, 1905^ 



MONTHLY SUMMARY. 



treasure. In inches. 

 Maxiniuni reduced to freezing, 30.06, 24th, A, 

 Minimum reduced to freezing, 28.91, 6tli, 10 a. 

 Reduced! maximum reading, 30.37, 24th, o A. 

 Keduced* minimum reading, 29.22, 6th, 10 A 



Mean semi-daily reduced, 29.S47 



Monthly range i.i; 



*A.ir Temperature. In Degrees Fahr. 



Highest 790, 27th, 2:30 P. 



Lowest, 22.0, 3d, 6 A. 



Mean hourly, 45-6 



Mean of means of max. and min 46.1 



Mean sensible (wet bulb), 40.0 



Monthly range 570 



Highest mean daily, 60.3,27th 



Lowest mean daily, 35.4, 2d 



Mean ma.ximum, 57.8 



Mean minimum, 34.4 



Mean daily range, 23.4 



Greatest daily range, 37.0, 24th 



recast daily range, 8.0, 5th 



Humidity. 



Mean dew point 33-5 



Mean force of vapor, 307 



Mean relative humidity, 66.7 



Precipitittion. In inches. 



Total precipitation, 2.56 



Number of days on which .01 inch or more 



rain or melted snow fell, 9 



Total snow in inches, Trace 



♦ Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4855 m. 



Greatest daily movement, .... 355 m., 17th 



Least daily movement, 24 m., 4th 



Mean daily movement 162m. 



Mean hourly velocity, 6.7m. 



Maximum pressure per square foot, 18 lbs.= 



60 m. per hour, 17th, 12 M., W. 

 Prevailing Direction, West. 

 Summary. 



West, 1 7 per cent. 



West, Northwest, 17 " " 



North, Northwest, 10 " " 



South, Southwest, 13 " " 



Other directions, 43 " " 



Weather. 

 Mean cloudiness observed, . . . .43 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i55hrs.=39 per cent. 



Number of clear days, 16 



Number of fair days, 9 



Number of cloudy days, 5 



Rright Sunshine. 



Number of hours recorded, . . . 247 hrs. = 6m 

 Kain, 4th, 5th, 6th, 10th, nth, 14th, 20th, 21st, 



24th, 26th, 29th. 

 Snotv, 17th. 

 Galea, 2,^ miles or more per hour, 41m. ist, 



N.N.; 44 m. 2d, N.N.W.; 38 m. 6th, W.N. 



W.; 60 m. 17th, W.; 39 m. iSth, W.; 48 m. 



2ist, S.S.W.; 35 m. 24th, W.S.W. 

 Thunder and Lightnino , 21st. 

 Vroat, 7th. 16th, 17th, 24th. 



