BULLETIN No. 322. 



OCTOBER, 1915 



Meteorological Observations 



MASSACHUSETTS 



CI3RARY 



JAN 2 411 



AGRICULTURAL EXPERIMENT ^^^ 



STATION. 



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



Height of haroineter above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Listricnients 72 ft. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 30.11, i6th, 6 A. 

 Minimum reduced to freezing, 29.28, 30th, 2 p 

 Reducedt maximum reading, 30.41, iitli, 9 a; 



i6th, 6 A. 

 Reducedt minimum reading, 29.58, 3otli, 2 p 



Mean semi-daily reduced 30.082 



Monthly range 0.83 



*Air Temperature. In Degrees Fahr. 



Highest 76.0, 13th, 14th, 15th, 17th 



Lowest 25.5, 25th 



Mean hourly 5i-7 



Mean of means of max. and min 52.4 



Mean sensible (wet bulb) 47-2 



Monthly range 50.5 



Highest mean daily 64.0, 15th 



Lowest mean daily 39-6i 23d 



Mean maximum 63.1 



Mean minimum 4i-8 



Mean daily range 21.3 



Greatest daily range 39-°. i7th 



Least daily range 4-5i 2d 



Hnmidity. 



Mean dew point 44-2 



Mean force of vapor 37i 



Mean relative humidity 81.6 



Precipitation. In inches. 



Total precipitation 2.89 



Number of days on which .01 inch or more 



rain fell 7 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3786 m 



Greatest daily movement 315m, 30th 



Least daily movement 15 m, ist 



Mean daily movement 122 m 



Mean hourly velocity 5.1 m 



Maximum pressure per square foot, 12.0 lbs = 



49 m per hour, 30th, i p, N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 30th, 4 p, N.W. 

 Prevailing direction, West. 



Summary. 



South Southwest 26 per cent 



West 19 " " 



North Northwest 16 " " 



Northwest 10 " " 



West Northwest 10 " " 



Other directions 19 " " 



Weather. 



Mean cloudiness observed .... 44 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .179 hours = 52 per cent 



Number of clear days 6 



Number of fair days 12 



Number of cloudy days 13 



Bright Sunshine. 



Number hours recorded, 162 hrs, =148 per cent. 

 Rain, 1st, 2d, 5th,;7th, 8th, 15th, 20th, 26th. 

 Thunder and Lightning, 26th. 

 Frosts, 9th. nth, 25th, 28th. 

 Gales, 35 or more miles per hour: 36m, 22d, 

 W.N.W.; 35m, 23d, N.W.; 49m, 30th, N.W. 



