LIBRARY OF THE 

 Massachusetls AirricHltural Collea^;. 



AMHERST. ftiA:iS. 



BULLETIN No. 441. 



SEPTEMBER 1925 



Meteorolooical Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXrEllIMENT 



STATION. 



Liiliiude, 42° 23' 48.5" N. Longitude 72° 31' 10" \V. 



Height of barometer above ground, jr ft. Above sea level, 2jj.^ ft. 

 Height oj Wind Instruments "J 2 ft. Time used, j^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxinuini reduced to freezing, 30.28, 26th, 11 A. 

 Mininuini reduced ti) freezins, 29.35, 21st, i A- 

 Reduced maximum reading, 30.59, 26tli, 11 A. 

 Reduced minimum reading, ?9.64, 21st, i a. 



.Mean semi-daily reduced 30.045 



Mdutlily range o 95 



Air Xeiiiperaliire. 



In Degrees Fahr. 



Highest S6.0, nth, 4P 



Lowest 26.0, 26tli, 6:30 A 



Mean liourly 61.1 



Mean of means of max. and min 61.0 



Mean sensible (wet bulb) 56.7 



Monthly range 60.0 



Highest mean daily 75.7, nth 



Lowest mean daily 45.5i 23d 



Mean maximum 71-7 



Mean minimum 5o-3 



Mean daily range 21.4 



Greatest daily range 40.0, 26th 



Least daily range 4.0, i6th 



Hi 



«<y. 



Mean dew jjoint 54 i 



Mean force of vapor 5J56 



Mean relative humidity 83.9 



Precipitation. In inches. 



Total precipitation, in inches 3 09 



Number of days on which .01 inch or more 

 rain fell 13 



Wiiitl. 



Total movement 3'^55.ni 



Greatest daily mf)vemenl 233m, 21st 



Least daily movement 36m, 4tli 



Mean daily movement n2 m 



Mean hourly velocity 4.7m 



Maximum pressure per square foot. 5.0 lbs = 



32m per hour, 2ist, 5P., S.S.W. 

 .Maximum velocity for 5 minutes, 20m per 



hour, 21st, 2 P., S..S.W. 

 Prevailing direction. West. 

 .Sunmiary. 



North Northeast 30 per cent 



South Southwest 23 " " 



South 13 " " 



North 10 " " 



Otlier directions 24 " " 



Weather. 



Mean cloudiness observed .... 57 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 191 hours = 51 i)er cent 



Number of clear days 6 



Num))er of fair days 11 



Number of cloudy days 13 



Kriiiht Sunshine. 



Number hours recorded, 182 = 49 per cent. 

 Kain, 3d, 4th, 6th, 7th, 8th, 12th. 13th, 14th, 

 15th, i6th, 17th, 24th, 27th, 28th. 



Frosts, 23d, 25th, 26th. 



Thunder and Liiih<nin£, 12th. 



Gales. None. 



