METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, ^i ft. Above sea level, 2-/^.^ ft. '■ 



Height of Wind Itistriiments 72 ft. 



BULLETIN No- 173. ^ MAY, 1903. 



i_ 



MONTHLY SUMMARY. 



PreHSiire. In inches. 

 Maxinuini reduced to freezing, 30.23, 2nd, 7 .\ 

 .Minimum reduced to freezing, 29.39, 1st, o a 

 Reduced! ma.ximum reading, 30.54, 2nd, 7 .\ 

 Keducedt^ minimum reading, 29.69, ist, o a 



Mean tri-daily reduced, 30.114 



Monthly range, . . . . • 8 



*Alr Teinperat II re. In Degree.s Falir. 



Highest, 92.5, 20th, 1 p. 



Lowest, 24.5, 2nd, 6 a 



Mean hourly, . 59.: 



Mean of means of n)a.\. and min., .... 59.8 



Mean sensible (wet Ijulb), 52.4 



Montlily range 68.0 



Highest mean daily, 73.2, 20th 



Lowestmean daily 42.S 2nd 



Mean maximum, 75.2 



Mean minimum, 44.4 



Mean daily range 30.S 



Greatest daily range, 45.0, 12th 



Least daily range, 15.5, 2Sth 



Jlmtiidit;/. 



Mean dew point, 44.9 



Mean force of vapor, 572 



Mean relative humidity, 61.3 



I'recipifiilinn. In inches. 



Total precipitation, 0.4S 



Number of days on whicli -oi inch or more 



rain or melted snow fell 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Total movement, 39oSm. 



Greatest daily movement, 325m., ist- 



Least daily movement, 27ni., 19th. 



Mean daily movement, 126m. 



Mean hourly velocity, 5.3n). 



Maximum pressure per square foot, 9.5 lbs.= 



44 »i- per hour, 1st, 10 A., W.N.W. 

 Prevailing Direction, Southwest. 



Summary. 



Northwest, 10 per cent. 



West, Southwest, 10 " " 



South -Soutlieast, 19 " " 



West, 10 " '• 



North Nortlnvest, 13 "' 



-South, 10 " " 



Otiier directions, 28 " " 



Weather. 



Mean cloudiness oljserved, .... 36 per cent. 

 Total cloudiness recorded by the Sun Tlier- 



mometer, 142 lirs.=3i per cent. 



.Number of clear days, 14 



Number of fair days, 14 



Number of cloudy days, >■ 3 



ttriffht Sunshine. 

 Number of liours recorded, . . . 311 iirs.=69j( 

 rtain, 4th, 7tii, 14th, 28th, 30th. 

 Oale», 35 miles or more per hour, 44m. 1st, 



W.N.W. 

 Frosts, 2nd. Thin ice formed. 

 Thitnder and Ijiyhtnliiy, 14th, 2Sth. 



