METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



^^n^vIPIEI^ST. 



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



Height of barometer above ground, 51 ft. Above sea level, 27^.^ ft. 

 Height of Wind Instrtunents 72 ft. 



BULLETIN No- 155. 



NOVEMBER, 1901 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.05, loth, 12 P 

 Minimum reduced to freezing, 28.92, 14th, 5 A 

 Reducedt maximum reading, 30.37, loth, 12 p. 

 Reducedt minimum reading, 29.23, 14th, 6 A 



Mean tri-daily reduced, 29.932 



Monthly range • i.i^ 



*Air Tempertttiire. In Degrees Fahr. 



Highest, 60.0, ist, i p 



Lowest, 6.0, 29th, 6 A 



Mean hourly, 33.4 



Mean of means of max. and min 33.6 



Mean sensible (wet bulb), 30.8 



Monthly range, 54.0 



Highest mean daily 50.2, 1st 



Lowest mean daily, 15.2, 28th. 



Mean maximum, 42.1 



Mean minimum, 25.1 



Mean daily range 17.0 



Greatest daily range, 32.0, 4th. 



Least daily range, .... 7.0, 13th, 17th, 23d. 



Untnidity. 



Mean dew point, 24.1 



Mean force of vapor 211 



Mean relative humidity, 71. i 



Precipititlion. In inches. 



Total precipitation, . • 3.0S 



Number of days on which .01 inch or more 



rain or melted snow fell 7 



Snow, total in inches, 0.3 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Witid. 



Total movement 4583m. 



Greatest daily movement, ... 40S m., 24th. 



Least daily movement, 12 m., 12th 



Mean daily movement, 152.8 m. 



Mean hourly velocity, 6.4 m. 



Maximum pressure per square foot, 17.5 lbs.— 



59 m. per hour, 24th, 7 p., E. 

 Prevailing Direction, North. 



Summary. 



Northwest 20 per cent. 



North, 17 " " 



East Northeast, 10 " " 



Other directions 53 " " 



Weather. 



Mean cloudiness observed, . . . . 65 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 193 hrs.=66 per cent. 



Number of clear days, 4 



Number of fair days, g 



Number of cloudy days, jy 



Bright Sunshine. 



Number of hours recorded, ... 100 hrs.=34K 

 Rain, ist, 9th, nth, 12th, 24th, 25th 

 Snotv, 9th, nth, 14th, 19th, 24th, 25th, 26th, 



29th, 30th. 

 Hail, nth, 24th. 

 Gales, 35 miles or more per hour, 43ni., 



loth, N.W., 39m., 13th, W.N.W., 40m., 



14th, VV., 59m., 24th, E., 35m., 26th, N.. 



35m., 27th, N. 



