METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiraent Station 



MASSACHOSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Itistruments 72 ft. 



BULLETIN No. 202. 



OCTOBER, 1905. 



MONTHLY SUMMARY. 



Hressiire, In inches. 

 Maximum reduced to freezing, 30.27, 29th, 9A. 

 Minimum reduced :to freezing, 29.12, 12th, 3 A. 

 Reducedt maximum reading, 30.58, 29th, 9 a, 

 Reducedt minimum reading, 29.42, 12th, 3 a. 



Mean semi-daily reduced, 30.101 



Monthly range 1.16 



*Air Temperature. In Degrees Fahr 



Highest 80.5,9th, 4 p. 



Lowest, 21.5,30th, 7 A. 



Mean hourly, 49.9 



Mean of means of max. and min 50.0 



.Mean sensible (wet bulb), 44.2 



Monthly range 59.0 



Highest mean daily, 64.7,19th 



Lowest mean daily, 35.3, 29th 



Mean maximum 62.3 



Mean minimum, 37.7 



Mean daily range, 24.6 



Greatest daily range, 40.5,8th 



Least daily range, 6.0, 20th 



Hntnidlty. 



Mean dew point, 40.3 



Mean force of vapor, 349 



Mean relative humidity, 75.9 



Precipitation. In inches. 



Total precipitation, 2.27 



Number of days on which .01 inch or more 

 rain or melted snow fell, 6 



* Temperature in ground shelter. 

 !■ Reduced to freezing and sea-level. 



Total movement, 3397 m. 



Greatest daily movement, .... 331 m., 21st 



Least daily movement, 13 m., 30th 



Mean daily movement, 109.6 m. 



Mean hourly velocity, 4.6 m. 



Maximum pressure per square foot, 9.0 lbs.= 



43 m. per hour, 21st, 11 a., N.W. 

 Prevailing Direction, West. 



Summary. 



Northwest, 23 percent. 



South, 23 " " 



South, Southwest, 10 " " 



North, Northwest, 10 " " 



Other directions, 34 " " 



Weather. 



Mean cloudiness observed, .... 36per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . ... 132 hrs.=39 per cent. 



Number of clear days, 13 



Number of fair days, 11 



Number of cloudy days, 7 



Bright Sunshine. 



Number of hours recorded, . . 209 hrs. = 6i* 



Rain, 3d. nth, 12th, 19th, 20th, 24th, 2Sth. 



6a2e8, 35 miles or more per hour, 35 m. nth, 

 E.S.E.; 43m. 2ist N.W. 



Ji'roats, 7th, 8th, 17th, 26th, 27th, 29th, 30th, 

 31st. 



