METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



^?^3VniiEI?,ST. 



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



Height of barometer above ground. 31 ft. Above sea level, 2JJ.3 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 131. 



NOVEMBER, 1899. 



MONTHLY SUMMARY. 



Fressiire. In inches. 



Maximum reduced to freezing, 30.23,17th, 9 a. 

 Minimum reduced to freezing, 29.14, ist, 2 P. 

 Reducedt maximum reading, 30.54, 17th, 9 A. 

 Reducedt minimum reading, 29.44, ist, 2 P. 



Mean tri-daily reduced, 30.006 



Monthly range, . . . . • i.io 



*Air Tetnperatiire. In Degrees Fahr. 



Highest, 58.0, 7th, 3 p. 



Lowest, 17.5, 14th, 7.30 A. 



Mean hourly, 37.0 



Mean of means of max. and mm., .... 37.3 



Mean sensible (wet bulb), 34.8 



Monthly range, 40.5 



Highest mean daily, 46.7, ist 



Lowest mean daily, 29.7, 14th 



Mean maximum, 46.3 



Mean minimum, 28.3 



Mean daily range, 18.0 



Greatest daily range, 35.0, 7th 



Least daily range, 4.5, 15th 



Huuiidity, 



Mean dew point, 29.8 



Mean force of vapor, 235 



Mean relative humidity, . . . • ... .76.2 

 Precipitation. In inches. 



Total precipitation, . • . 2.17 



Number of days on which .01 inch or more 



rain or melted snow fell S.o 



Snow total in inches, ... 0.5 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3361 m 



Greatest daily movement, .... 295 m., 12th 



Least daily movement 10 m., 15th 



Mean daily movement, 112.0 m. 



Mean hourly velocity, 4-7 m. 



Maximum pressure per square foot, ii.lbs.^ 



47 m. per hour, 12th, 11 A., W.N.W. 

 Prevailing Direction, Northwest. 

 Summary. 



North, 30 per cent. 



Northwest '7 " " 



North, northeast, 10 " " 



West, 13 " " 



South, 10 " " 



South, southwest, 10 " " 



Other directions, 10 " " 



Weather. 



Mean cloudiness observed 53 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, 163 hrs. =56 per cent. 



Number of clear days, 8 



Number of fair days, 9 



Number of cloudy days, 73 



Bright Sunshine. 



Number of hours recorded, . . . 130 hrs. =441* 

 Kain, ist, 3d, 4th, nth, 12th, 14th, 15th, 19th, 



22d. 



Snow, i2th, 14th, 15th. 



Bail, . . nth. 



Gales, 35 miles or more per hour, 35m., ist, 

 N.; 3^ni., 2d, N.: 44m., loth, \V.; 47 m., 

 i2th, W.N.W.; 37m.. i6th, N.N.E-; 39m., 

 2oth, N.;35m., 23d, N. 



