METEOROLOGICAL OBSERVATORY 



OF THE 



Hatcli Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



./^isa.:b3:jei:rst. 



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



Height of barometer above ground, Ji ft. Above sea /eve/, 2'jj.^ ft. 

 HeigJit of Wind Instriwients J 2 ft. 



BULLETIN No- 148. 



APRIL, 1901 



MONTHLY SUMMARY. 



I'res.titi-e. In inches. 

 Maximum reduced to freezing, 30.22, 28th, 9 A 

 Minimum reduced to freezing, 29.03, 7th, 12 M 

 Reducedt maximum reading, 30.52,28th, 9 A 

 Reduced! minimum reading, 29.33, 7th, 12 M 



Mean tri-daily reduced, 29.970 



Montlily range, . . . . • 1.19 



*Air Tetnperatnre. In Degrees Falir. 



Higliest, 86.5, 29tli, 4 P. 



Lowest, 2S.0, 13th, 4:30 A. 



Mean hourly, 46.8 



Mean of means of max. and min., .... 46.4 



Mean sensible (wet bulb), 45.6 



Monthly range, 58.5 



Highest mean daily 63.5, 29th 



Lowest mean daily 39.0, 3d 



Mean ma.ximum, 55.5 



Mean minimum, 37.4 



Mean daily range, 18.1 



Greatest daily range, 50.0, 29th 



Least daily range, 5.0, 3d 



Minn id it;/. 



Mean dew point, 35.6 



Mean force of vapor, 348 



Mean relative humidity, 68.1 



Precipitation. In inches. 



Total precipitation, . • 5.95 



Number of days on which .01 inch or more 



rain or melted snow fell, 14 



Snow, Total in inches, T. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 6211m. 



Greatest daily movement, . . . . 448 ni., nth 



Least daily movement, 47 m., 6th 



Mean daily movement 207.0 m. 



Mean hourly velocity, 8.6 m. 



Maximum pressure per square foot, 13.5 lbs.= 



52 m. per hour, 15th, 5:00 p., N.E. 

 Prevailing Direction, North, Northeast. 



Summary. 



North, Northeast, 13 per cent. 



North Northwest, 13 " " 



Northeast, 13 '' " 



North, . • 27 " " 



Other directions, 34 " " 



IVeatJier. 

 Mean cloudiness observed, .... 75 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 299 hrs.=74 per cent. 



Number of clear days, 6 



Number of fair days, 2 



Number of cloudy days, 22 



Bright Sunshine. 



Number of hours recorded, . . . 103 hrs. =2651 

 Sain, 3d, 4th, 6th, 7th, 8th, 9th, loth, i6th, 



19th, 20th, 2ISt, 22d, 23d, 24th, 25th, 30th. 



Snow, 3d. 



Gales, 35 miles or more per hour, 35m., ist, 

 N.N.W.; 39 m., loth, N.N.W.; 37 m., nth, 

 N.N.E. ;52 m., 15th, N.E.; 36 m., i6th, N.; 

 35 m. ,26th, N.N.E. 



