METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground^ 51 fi- Above sea level, 2jj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 195. 



MARCH, 1905. 



MONTHLY SUMMARY. 



Pretaure. In inches. 

 Maximum reduced to freezing, 30. 28, 15th, lo A- 

 Minimum reduced to freezing, 29.40, loth, 5 a. 

 Reducedt maximum reading, 30.60,15th, 10 A. 

 Reduced^ minimum reading, 29.71, loth, 5 A. 



Mean semi-daily reduced, 30.118 



Monthly range, 0.S9 



*Air Temperature. In Degrees Fahr. 



Highest 77.0, 29th, 4:30?. 



Lowest, i.o, 3d, 7.30 A. 



Mean hourly, 33-' 



Mean of means of max. and min 32.8 



Mean sensible (wet bulb), 29.4 



Monthly range, 76.0 



Highest mean daily, 52.2,29th 



Lowest mean daily, 18.2, 5th 



Mean maximum, 44-o 



Mean minimum, 21.5 



Mean daily range, 22.5 



Greatest daily range, 43-°. 29th 



Least daily range, 5.0, 8th, 20th 



Humidity. 



Mean dew point, 24.8 



Mean force of vapor, I95 



Mean relative humidity, 76-7 



Precipitation. In inches. 



Total precipitation, 3-66 



Number of days on which .01 inch or more 



rain or melted snow fell, 12 



Total snow in inches 54 



Snow on ground at end of month, . . . none 

 • Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3006 ni. 



Greatest daily movement, .... 240 m., 19th 



Least daily movement, iS m., 29th 



Mean daily movement, 97ni. 



Mean hourly velocity, 4.0m. 



Maximum pressure per square foot, 16.5 lbs.:= 



57 m. per hour, 19th, 3 p., N.E. 

 Prevailing Direction, West. 

 Summary. 



West, Northwest, 23percent. 



North, 13 " " 



Northwest, to " " 



South 23 ■' " 



South, Southwest, 10 " " 



Other directions, 21 " " 



Weather. 



Mean cloudiness observed, . . . .46 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 155 hrs. =42 per cent. 



Number of clear days, 13 



Number of fair days, 10 



Number of cloudy days, 8 



Bright Sunshine. 



Number of hours recorded, . . . 216 hrs. = 58* 

 Rain, 7th, 8th, 9th, loth, 19th, 20th, 24th, 25th, 



26th, 27th, 30th. 

 Hail, 9th, 20th. 

 Snow, 4th, 7th, 2ist. 

 Gales, 35 miles or more per hour, 36m. 4th, 



N.N.W.; 57m. 19th, N.E.; 35m. 31st, 



N.N.W. 

 Days of Sleighing, 6 



