METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 2^' 48.5" N. Longitude 72* 31' 10" W. 



Height of barometer above ground, ^i ft. Above sea level, 2^^.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No 201. 



SEPTEMBER, 1905. 



MONTHLY SUMMARY. 



Fresaure. In inches. 

 Maximum reduced to freezing, 30.11, 15th, 8 A. 

 Minimum reduced to freezing, 29.47, 22d, 5 p. 

 Reducedt maximum reading, 30.41, ijthi, 8 a, 

 Keducedt minimum reading, 29.75, 22d, 5 p. 



Mean semi-daily reduced, 30.046 



Montlily range 0.66 



*.4ir Temperature, in Degrees Falir. 



Higliest, 85,0,30111,3:30 P 



Lowest, 32.0, 27th, 6:30 A. 



Mean hourly, 59, 



Mean of means of max. and min., .... 59.8 



.Mean sensible (wet bulb), 55.0 



Monthly range 53.0 



Highest mean daily, 66.5,4th 



Lowest mean daily, 45.4, 26th 



Mean maximum 70.9 



Mean minimum 48.7 



Mean daily range. . . . .' 22.2 



Greatest daily range, 3S.0, 28th 



Least daily range, 4.0, iSth 



Hiiinidity. 



Mean dew point, 52.4 



Mean force of vapor, 489 



Mean relative humidity, 83.2 



Precipitation. In inches. 



Total precipitation, 6.26 



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. 



Total movement .2527™. 



Greatest daily movement, .... 196 m., 25th 



Least daily movement 4 m., ist 



Mean daily movement, 84 m. 



Mean hourly velocity, 3-5 m. 



Maximum pressure per square foot, 7.0 lbs.= 



37 m. per hour, 13th, 6 p., N. 

 Prevailing Direction, West. 



Summary. 



North 13 percent. 



Southwest, ■ 13 " " 



South, 10 " " 



South, Southwest, 10 " " 



West, Southwest, 10 " " 



West, 10 " •' 



Other directions, 34 " " 



Weather. 

 Mean cloudiness observed, . . . . 4S per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . 187 hrs. = 50 per cent. 



Number of clear days, 10 



Number of fair days, 8 



Number of cloudy days, 12 



Uright Sunshine. 



Number of hours recorded. . . 1S6 hrs. = 50ft 

 Rain, ist, 2d, 3d. 4th, 6th. nth, 12th, 15th. 

 i6th, 17th, i8th, 19th, 20th. 



Galen, 2i miles or more per hour, 37 m. 13th, 



N. 



Thunder and Lightnina , \t\\, 6th, 

 Ziight yrosts, i;th, 24th, 26th, 27th. 



24th. 



