BULLETIN No. 346. 



OCTOBER, 1917 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTUIUL EXPERIMENT 



STATION. 



Latitude, 42" 23' 48,5" N. Longitude 72* 31' 10" VV. 



Heij^ht of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Prpssnre. In inches. 



Maximum reduced to freezing, 30.10, iSth. 9 a 

 Minimum reduced to freezing, . 28.98, 30th, 4 p 

 Reduced maximum reading, . . 30.40, 18th, 9A; 



23d, 8 A. 

 Reducedt minimum reading, . 2 .29, 30th, 4 p 



Mean semi-daily reduced 30-052 



Monthly range i-H 



*Air Temperature. In Degrees Fahr, 



Highest 700, 27th, 3 p 



Lowest 27.0, 21st, 6 A 



Mean hourly 47-° 



Mean of means of max. and min 47.4 



Mean sensible (wet bulb) 43 1 



Monthly range 43-0 



Highest mean daily 60.1, 19th 



Lowest mean daily 37-7, 3ist 



Mean maximum 57.9 



Mean minimum 36-8 



Mean daily range 21. i 



Greatest daily range 31.5. 2d, 3d 



Least daily range 3-5t24th 



Hamidity. 



Mean dew point 40.0 



Mean force of vapor 317 



Mean relative humidity 79.6 



Precipitation. In inches. 



Total precipitation, in inches 6.60 



Total snow, in inces 



Number of days on which .01 inch or more 



rain fell 12 



Days of sleighing, . . . 



Wind. 



Total movement 4118 m 



Greatest daily movement 469m, 30th 



Least daily movement 23m, 17th 



Mean daily movement i33-0 ni 



-Mean hourly velocity 5o m 



Maximum pressure per square foot, 17.0 lbs = 



58 m per hour, 30th, 9 A, S.W. 

 .Maximum velocity for ; minutes 36m per 



hour, 30th, 10 A, S.W. 

 Prevailing direction. South Southwest. 



Summary. 



South 19 per cent 



South Southwest 19 



Southwest 13 



.Southeast 10 



Northeast 10 



Other directions 28 



Weather. 



Mean cloudiness observed .... 55 per cent 

 Total cloudiness recorded by the .Sun 



Thermometer . . 205 hours = 59 per cent 



Number of clear days 10 



Number of fair days 5 



Number of cloudy days ib 



Briiibt Sunshine. 



Number hours recorded, 142 hrs, = 41 per cent. 

 Bain. 5th, 8th. 9th, loth, 12th, 15th, 19th, 20th, 



24th, 27th, 28th, 30th. 

 Thander and Lidhtnint, 5th, 15th, 27th. 

 Frosts, 7th, 13th, 17th, 21st, 23d, 29th, 31st. 

 Gales, 35 or more miles per hour. 41m, 19th, 



S.: 51m, 24th, S.; 44m, 28th. S.W. : 58m, 



30th, S.W. 



Temperature in ground shelter. 

 • Reduced to freezing and sea-level. 



