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, 2yj.^ ft. 

 Height of Wind Instrinnents 72 ft. 



BULLETIN No. 153. 



SEPTi^MBER, 1901 



MONTHLY SUMMARY. 



Prea.^ure. In inches. 

 Maximum lecUiced to freezing, 30.21,26th, 10 A 

 Minimum reduced to freezing, 29.22, 13th, 2 A. 

 Reducedt maximum reading, 30.51, 26th, 10 A 

 Reducedt minimum reading, 29.51, 13th, 2 A. 

 15th, 10 r. 



Mean tri-daily reduced, 30.031 



Monthly range ■ 1.00 



*A.ii' Temperature. In Degrees Fahr. 



Higliest, 92-0, 7th, 3 p. 



Lowest, 33.0, 26th, 6 A 



Mean hourly, 62.1 



Mean of means of ma.x. and min., .... 62.7 



Mean sensible (wet bulb), 57.3 



Monthly range 59.0 



Highest mean daily 73.1, 6th 



Lowest mean daily, 46.7, 20th 



Mean maximum, 74.9 



Mean minimum, 50.6 



Mean daily range, 24.3 



Greatest daily range, 3S.0, 9th 



Least daily range, S.o, iSth 



Ifnniiiliti/. 



Mean dew point 54,: 



Mean force of vapor, 610 



Mean relative humidity, 76.8 



Precipitation. In inches. 



Total precipitation, . ■ 4.1; 



Number of days on which .01 inch or more 

 rain or melted snow fell, 11 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 235Sm. 



Greatest daily movement, 249 m., Sth 



Least daily movement 4 m., 6th, iSth 



Mean daily movement, 78.6 m. 



Mean hourly velocity, 3-3 ni. 



Maximum pressure per square foot, 24.0 lbs.= 



69 m. per hour, nth, 5 P., S. 

 Prevailing Direction, West Southwest. 



Summary. 



South, 20 per cent. 



West, 13 " " 



Northwest, 10 " " 



North Northwest, 10 " " 



North, 10 " " 



Southwest, 10 " " 



Other directions 27 " " 



Weather. 

 Mean cloudiness observed, .... 51 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 160 hrs.=43 per cent. 



Number of clear days, 14 I 



Number of fair days, 6 ' 



Number of cloudy days, 10 ■ 



Bright Sunshine. 1 



Number of hours recorded, . . . 215 hrs. = 57?t 

 Rain, ist, 2d, loth, nth, 12th, 13th, 15th, 



17th, i8th, 20th, 29th, 30th. 

 Oales, 35 miles or more pernour,69m.iith,S. 

 Thunder and lAghtning, 15th. 

 Heavy Froat, 26tl). 



