BULLETIN No. 347. 



NOVEMBER, 1917 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, J/ /?. Above sea level, 2jj.^ ft. 

 Height oj Wind Iiistnitnents 72 ft. 



MONTHLY SUMMARY. 



Pressiiio. In inches. 

 Maximum reduced to freezing, 30.25, 4th. S p 

 Minimum reduced to freezing, 29.15, 22d, 11 p 

 Reduced maximum reading, . . 30.54, 4th, 8 p 

 Reduced! minimum reading, . 29.46, 22d, up 



Mean semi-daily reduced 30-065 



Monthly range i.oS 



•Air Temperature. In Degrees Fahr 



Highest 62.0, 6th, 2 P 



Lowest 7-0, 29th, 7 A 



Mean hourly 33 



Mean of means of max. and min 34.6 



Mean sensible (wet bulb) ^8.4 



Monthly range 55-o 



Highest mean daily 41. 7i 6th 



Lowest mean daily 16.4, 27th 



Mean maximum 45.5 



Mean minimum 23.6 



Mean daily range 21.9 



Greatest daily range 38.0, 6th, 15th 



Least daily range 7.0. : 



Humidity. 



Mean dew point 22.2 



Mean force of vapfir iSo 



Mean relative humidity 71. i 



Precipitation. In inches. 



Total precipitation, in inches 0.63 



Total snow, in inches \ 



Number of days on whicli .01 inch or more 



rain fell 4 



Days of sleighing, . . . 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 3721 m 



Greatest daily movement 356m, 25th 



Least daily movement im, 30th 



Mean daily movement 124.0 m 



Mean hourly velocity 5.2 m 



Maximum pressure per square foot, 6.5 lbs = 



36m per hour, 25tli, 6 .a, W.N.W.: 26th, 9.\, 



N.N.W. 

 Maximum velocity for 5 minutes 24m per 



hour, 26th, 9 A, N.N.W. 

 Prevailing direction, Northwest. 



Summary. 



North Northwest 27 per cent 



North 17 " " 



West 17 " " 



Northwest 13 " " 



Other directions 26 " " 



Wi 



Mean cloudiness observed .... 34 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 123 hours = 42 per cent 



Number of clear days 12 



Number of fair days 9 



Number of cloudy clays g 



Bright Sunshine. 



Number hours recorded, 170 hrs, = 58 per cent. 

 Kain, 21st, 22d, 23d, 24th. 

 Snow, 24th, 28th. 



Gales, 35 or more miles per hour. 36m, 25th 

 W.N.VV.; 36m, 26th, N.N.W. 



