BULLETIN No. 465. 



SEPTEMBER, 1927 



Meteorological Observations 



MASSACHUSETTS 



AGUICULTUIUL EXPERIMENT 



STATION. 



■\W^- 



Latitude, 42' 23' 48.5" N. Longitude 72* 31' 10" '^\?.^ 



Heii^ht of barometer aboi'e ground, §i ft. Above sea level, -?Z^^oXX?- - ^ 



Heig]it of Wind Instruments J 2 ft. Ti)ne ?/i"^' 





. ^^Ts^^ 



MONTHLY SUMMARY. 



Pressnte. In inches. 



Maximum redvicedto freezing, 30.14, 27th, 12 P. 

 Minimum reduced to freezing, 29.20, nth, i P. 

 Reduced maximum reading, 30.44, 27th, 12 P. 

 Reduced minimum reading, 29.49, nth, i p. 



Mean semi-daily reduced 30-oi5 



Monthly range 0.9 



Air Temperature. 



In Degrees Fahr. 



Highest • . . . 84.5,3d, 4 p 



Lowest 34.5, 25th, 6-30 A 



Mean hourly 60.6 



Mean of means of max. and niin 61.5 



Mean sensible (wet bulb) 57.0 



Monthly range 50.0 



Highest mean daily 71.6, 3d 



Lowest mean daily 52.6, 23d 



Mean maximum 74-5 



Mean minimum 48-4 



Mean daily range 26.1 



Greatest daily range 43.0, 25th 



Least daily range 5-o, ist 



Hnmidity. 



Mean dew point 55.2 



Mean force of vapor 505 



Mean relative humidity S9.0 



Precipi«a<ioii. In inches. 



Total precipitation, in inches 2.79 



Number of days on which .01 inch or more 

 rain fell ' 4 



Wind. 



Total movement 2;i5m 



Greatest daily movement i86m, 30th 



I^east daily movement 33m, 17th 



Mean daily movement 84m 



Mean hourly velocity 3.5m 



Maximum pressure per square foot, 6.0 lbs = 



3;m per hour, nth, 12 M. S.S.W. 

 Maximum velocity for 5 minutes, 24m per 



hour, nth, 2 P., N.W. 

 Prevailing direction. South Southeast 



Summary. 



South 30 per cent 



South Southwest 17 " " 



South Southeast '3 " " 



East 10 " " 



Other directions 30 " " 



Weather. 



Mean cloudiness observed .... 48 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 140 hours = 38 per cent 



Number of clear days 10 



Number of fair days 14 



Number of cloudy days 6 



Itri^ht Suns III lie. 



Number hours recorded. 233 =^ 62 per cent. 

 Rain, ist, 2d, i ith, 13th, 15th, 19th. 

 Thunder and Liiihtninit. nth, 19th, 30th. 

 Frosts, None. 

 Gales, 35m, nth, S.S.W. 



