METEOROLOGICAL OBSERVATORy 



Hatch Experiiiieiit Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 5^ ft- Aboi'e sea level, 2JJ.5 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 184, 



APRIL, 1904. 



MONTHLY SUMMARY. 



freasure. In inches. 

 Maximum reduced to freezing, 3o.ig, 23d, 8 A- 

 Minimum reduced to freezing. 29.20, loth, 3 A. 

 Reducedt maximum reading, 30. 50, •23d, S A. 

 Keducedt minimum reading, 29.50, iotli,3A. 



Mean semi-daily reduced, 29.967 



Monthly range, i-oo 



^Air Teinperatiire. In Degrees Falir. 



Highest 70.5. 25th, 4 p. 



Lowest, 20.0, 4th, 6 A. 



Mean hourly, 42-^ 



Mean of means of max. and min 43.2 



Mean sensible (wet bulb), 37-3 



Monthly range, 50'5 



Highest mean daily 54-7.3otli 



Lowest mean daily 30ot '4th 



Mean maximum, 53-6 



Mean minimum, 32S 



Mean daily range 20.S 



Greatest daily range, 38.o, 22d 



Least daily range, 4.3,9th' 



Ifntniilitj/. 



Mean dew point, 31.5 



Mean force of vapor, 267 



Mean relative humidity, 70.8 



Frecipitation. In inches. 



Total precipitation, 5.73 



Number of days on which .01 inch or more 



rain or melted snow feJl, 12 



Snow, total in inches, 2 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 4902 m. 



Greatest daily movement, 360m., 3d 



Least daily movement, 53»i-. ist, 6th 



Mean daily movement 163m. 



Mean hourly velocity, 6.8m. 



Maximum pressure per square foot, 15.5 lbs.= 



56 m. per hour, 2d, 11 A., N.E. 

 Prevailing Direction, West, Northwest. 

 Summary. 



Northwest, 17 per cent. 



North, Northwest, 13 " " 



West, 13 " " 



South, 10 " " 



Other directions, 47 " " 



Weather. 



Mean cloudiness observed, . . . .52 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . 22ohrs.=55 percent. 



Number of clear days, 10 



Number of fair days, 7 



Number of cloudy days 13 



Itriglit Sttimhine. 



Number of hours recorded, . . . 182 l)rs.=4;?l 

 Kai'n, ist, 2d, 7th, gth, loth, 12th, 15th, 19th, 



20th, 25th, 26th, 27th, 2Sth, 29th, 30th. 

 Snow, 14th. i6th, 19th, 20th. 



Galen, 2S miles or more per hour, 56m. 2d, 

 N.E.; 36m. 3d, N.N.W. ; 36m. 12th, W. : 

 T,(im. 14th, W.; 44m. i6tli, N.; 41m. 21st, 

 N.N.W. 



Thunder and TA{fhtning, .... ist, 30th 



