METEOROLOGICAL OBSERVATORY 



OF TMn 



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, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 177. 



SEPTEMBER. 1903. 



MONTHLY SUMMARY. 



Fre»anre. In inches. 

 Maximum reduced to freezing, 30.12, igth, 8 a . 



20th, 7 A. 

 Minimum reduced to freezing, 29.35, i7tli,4 i'' 

 Reducedt maxinuim reading, 30.42, 19th, S a., 



20th, 7 a. 

 Reduced* minimum reading, 29.64, 17th, 4 r. 



Mean tri-daily reduced, 30.095 



Monthly range 7S 



*Air Temperntiire. In Degrees Fahr. 



Higiiest, 91.0, 14th, 4 r. 



Lowest, 305, 30th, 6 a. 



Mean liourly, 61.3 



Mean of means of max. and min., .... 61.9 



Mean sensible (wet bulb), 56.6 



Monthly range 60.5 



Highest mean daily 78.4,14111 



Lowestmean daily, 45.5, 29th 



Mean maximum, '. . . . 75.2 



Mean minimum, 4S.5 



Mean daily range, 26.7 



Greatest daily range, 39.0, 30th 



Least daily range, i4.5,27tli 



JIutnidity . 



Mean dew point, 52.5 



Mean force of vapor 600 



Mean relative humidity, 75.0 



Precipitation. In inches. 



Total precipitation, i.'')6 



Number of days on which .01 inch or more 



rain or melted snow fell, 3 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement iSgom. 



Greatest daily movement, .... 321m., 17th. 



Least daily movement i8m., ist, 19th. 



Mean daily movement 96m. 



Mean hourly velocity, 4m. 



Maximum pressure per square foot, 7.5 lbs.= 



39 m. per hour, 17th, 2 r., S.S.E. 

 Prevailing Direction, Southwest. 



Summary. 



West, 30 per cent. 



Northwest 13 " " 



South 13 " " 



South Southeast, 13 " " 



Southwest, 10 " " 



Other directions, 21 " 



Weather. 



Mean cloudiness observed, .... 42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 137 hrs.=37 per cent. 



Number of clear days, 15 



Number of fair days, 8 



Number of cloudy days, 7 



Jirlght Sunshine. 



Number of hours recorded, . . . 236hrs. = 63i< 



Rain, i6th, 17th, 27th, 2Sth. 



Oales, 35 miles or more per hour, 39m. 17th, 



S.S.E. 

 Thunder and Liffhtning, ;th, 17th. 27th. 

 Frost, 2;th, 30th. 



