METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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

 Height of Wind Instruments J 2 ft. 



BULLETIN No. 142. 



OCTOBER, 1900. 



MONTHLY SUMMARY. 



Vreaaure. In inches. 



Maximum reduced to freezing, 30.21, 31st, 10 A. 

 Minimum reduced to freezing, 29.14, i6th, 3 p. 

 Reducedt maximum reading, 30.52, 31st, 10 p. 

 Reduced! minimum reading, 29.42, i6th, 3 p. 



Mean tri-daily reduced, 30-i5i 



Monthly range, . . . . • 1.07 



*Air Tetnperature, In Degrees Fahr. 



Highest, 83.0, 5th, 2:30 p. 



Lowest 22.0, 20th, 6 A. 



Mean hourly, 54.5 



Mean of means of max. and min., .... 55.4 



Mean sensible (wet bulb), 51.5 



Monthly range, 61.0 



Highest mean daily, 67.9, 5th 



Lowest mean daily, 38.8,20th 



Mean maximum, 65.7 



Mean minimum 45.1 



Mean daily range, 20.6 



Greatest daily range, 38.0, 21st 



Least daily range, 3.0, 27th 



Hutnidity. 



Mean dew point, 4 



Mean force of vapor, 465 



Mean relative humidity, 77.0 



Precipitation. In inches. 



Total precipitation, . • 3.72 



Number of days on which .01 inch or more 

 rain or melted snow fell, 12 



* Temperature in gjround shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 33i5'ii- 



Greatest daily movement, .... 283 m., 17th 



Least daily movement, 13m., 13th 



Mean daily movement 106.9 m. 



Mean hourly velocity, 4.5 ni. 



Ma.ximum pressure per square foot, ro lbs.= 



45 m. per hour, i6th, 3 p., S.W. 

 Prevailing Direction, North, Northeast. 

 Summary. 



Southeast, 10 per cent. 



North, 10 " " 



Northwest, 10 " " 



Northeast, 16 " " 



West, 10 " " 



South, 10 " " 



Other directions, 34 " " 



Weather. 

 Mean cloudiness observed, .... 64 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 205 hrs. =60 per cent. 



Number of clear days, 4 



Number of fair days, 12 



Number of cloudy days, 15 



Kright Sunshine, 

 Number of hours recorded, ... 136 hrs.=405t 

 Rain, 7th, Sth, gth, loth, nth, 14th, 16th, i8th, 



23d, 24th. 27th, 2Sth, 30th. 

 Frost on Low Lands, 12th. 

 Heavy Frost, 17th, 18th, 19th, 20th. 

 Oales, 35 miles or more per hour, 45ni., i6th, 

 S. VV.; 36m., 17th, N. N. VV.; 37m., iSth, 

 W.NW. 



