METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 31 ft. Above sea level, 2'/j.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. I 30. OCTOBER. 1899. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxinuimreduced to freezing-, 30.19, aad, 8 a- 

 Mininnini reduced to freezing, 29.44, 6th, 9 v' 

 Reducedt maximum reading, 30.50, 22d, 8 -X 

 Reducedt minimum reading, 29.74, 6th, 9 p. 



Mean tri-daily reduced 30.1S9 



Monthly range, ... • 76 



*Air Tetnperature. In Degrees Fahr. 



Highest, 82.0, 13th, 3 P. 



Lowest, 20.5, 22d, 6 a. 



Mean liourly, ;i.i 



Mean of means of max. and min., . . . .51.9 



Mean sensible (wet bulb), 48.0 



Monthly range 61.5 



Highest mean daily, 67.6, iSth 



Lowest mean daily, 36.S, 2d 



Mean maximum, 62.5 



Mean minimum, 41.4 



Mean daily range 21. i 



Greatest daily range, 40.5, 5th 



Least daily range, 5.0, 2Sth 



Hninidity. 



Mean dew point, 48. S 



Mean force of vapor, 424 



Mean relative humidity, . . . ■ ... .75.9 



freclpitation. In inches. 



Total precipitation, . • 1.S4 



Number of days on which .01 inch or more 

 rain or melted snow fell, 9. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 2582 m. 



Greatest daily movement, ... 227 m., 7th 



Least daily movement 5 m., 24th 



Mean daily movement, 83.3 m. 



Mean hourly velocity, 3-5 ni. 



Maximum pressure per square foot, 6.5 lbs.= 



36 m. per hour, 21st, lo A., N. 

 Prevailing Direction, W. N. W. 

 Summary. 



North 16 per cent. 



Northwest, 10 " " 



North, northeast, 16 " " 



South 10 " " 



Southwest, 10 " " 



South, southwest, 16 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed, .... 60 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 201 hrs.=59 per cent. 



Number of clear days, -5 



Number of fair days, 14 



Number of cloudy days, 14 



Bright Sunshine. 



Number of hours recorded, . . .i4ohrs.=4Hi 

 Rain, 6th, 8th, 9th, 17th, i8th, 20th, 23d, 26th, 



2Sth, 29th, 31st. 

 Gales, 35 miles or more per hour, 36ni., 



21st, N. 



