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 levels ^73-5 ft- 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 2 15. 



NOVEMBER, 1906. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxiimun reduced to freezing, 30.11, 4th, 9 A.; 

 Miniimini reduced to freezing, 29,05, i6th, 3A. 

 Reducedt maximum reading, 30.42, 4th, g a.; 

 Reducedt minimum reading, . 29.37, i6th, 3 A. 



Mean semi-daily reduced, 30.038 



Monthly range 1.05 



*Air Temperature. In Degrees Fahr. 



Highest, 62.0, 3d, 2:00 P. 



Lowest, 18.5, 30th, 6:00 A. 



Mean hourly, 38.5 



Mean of means of max. and min 3S.7 



Mean sensible (wet bulb), 33.5 



Monthly range, 43.5 



Highest mean daily, 50.4,19th 



Lowest mean daily, 27.2,15th 



Mean maximum, 47.4 



Mean minimum, 30.0 



Mean daily range, 17.4 



Greatest daily range, 33.0, 17th, 



Least daily range, 3.5,21st 



Hntnidity. 



Mean dew point 27.7 



Mean force of vapor 223 



Mean relative humidity, 72.2 



Precipitation. In inches. 



Total precipitation, 1.9S 



Number of days on which .01 inch or more 

 rain or melted snow fell, 12 



Total snow in inches, 4 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 597S m. 



Greatest daily movement, 480 m., ist 



Least daily movement, 52 ni., gth, 



Mean daily movement, 199 m. 



Mean hourly velocity, 8.3 m. 



Maximum pressure per square foot, 8.5 lbs.= 

 41 m. per hour, 22d,9 p., W.N.W. 



Maximum velocity for 5 minutes, 33 m. per 

 hour 29th, 9 A., N.N.W. 



Prevaihng Direction, Northwest. 



Summary. 



North Northwest, 27 percent. 



North, 17 " " 



West, 13 " " 



West, Northwest, 13 " " 



Northwest, 10 " " 



Other directions, 20 " " 



Weather. 



Mean cloudiness observed, . . . .53 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 138 hrs. =47 per cent. 



Number of clear days, 13 



Number of fair days, 5 



Number of cloudy days, 12 



Bright Sunshine. 



Number of hours recorded, . . 155 hrs. = 53^ 

 Rain, gth, loth, nth, 12th, iSth, 20th, 21st, 



22d, 26th, 27th, 2Sth, 30th. 

 Snotv, nth, 13th, 15th, i6th, 2Sth, 30th. 

 Days Sleighing . 2. 

 G«/«s, 35 miles or more per hour, 35 m. ist, 



N.N.W.; 41 m. 22d, W.N.W. ; 39 m. 23d, 



W.N.W. ; 39 m. 29th, N.N.W. 



