UBRARYOf iHt 

 Massachusetts AcricuUur;!! 

 AMHERST. WlAi>i>. 



BULLETIN No. 429. 



SEPTEMBER, 1924 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXPEllIMENT 



STATION. 



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



Height of barometer above ground, 5^ ft- Above sea level, 2yj.^ ft. 

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



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing 30.35, 27th, 8 A. 

 Minimum reduced to freezing, 29.17, 30th. 7 p. 

 Reduced maximum reading, 30.65, 27th, 8 A. 

 Reduced minimum reading, 29.46, 3otli, 7 p. 



.Mean semi-daily reduced 30 0S9 



Montlily range i.io 



Air Temperainre. In Degrees Fahr. 



Highest 90-5- 2d, 2 p.. 



Lowest 32 5, 25th, 7 A. 



Mean hourly 58.7 



Mean of means of max. and min 59.2 



Mean sensible (wet bulb) 536 



Monthly range 58.0 



Highest mean daily 75.1, 1st 



Lowest mean daily 50.7, 24th 



Mean maximum 71.5 



Mean mininuim 46.8 



Mean daily range 24.7 



Greatest daily range 40.5,25th 



Least daily range 12.0, 14th 



Humidity. 



Mean dew point 51.0 



Mean force of vapor 479 



Mean relative humidity 80.1 



Precipitation. In inches. 



Total precipitation, in inches 5. 87 



Number of days on which .01 inch or more 

 rain fell 7 



Wind. 



Total movement 3274 m 



Greatest daily movement 384m, 30th 



Least daily movement 35m, i6th 



Mean daily movement 109m 



Mean hourly velocity 4.5m 



Maximum pressure per square foot, 10 lbs = 



45"! per hour, 30th, 5 p., S. 

 Maximum velocity for 5 minutes, 30m per 



hour, 30th, 8 p., S. 

 Prevailing direction. South, Southwest. 



Summary. 



South 27 per cent 



South Southwest 23 " " 



North ,..••■ 10 " " 



West Southwest 10 " " 



Other directions 30 " " 



Weather- 

 Mean cloudiness observed .... 47 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 1S5 hours = 50 per cent. 



Number of clear days 5 



Number of fair days 14 



Number of cloudy days 11 



Bright Sunshine. 



Number hours recorded, 18S = 50 per cent. 

 Rain, ist, 2d, 5th, 9th, loth, 12th, 17th, 



22d, 29th, 30th. 

 Thunder and Liiihtninii. 2d, 5th, 9th. 

 Frosts, 24th, 25th, 26th. 

 Gales, 40m., gth, S., 45'"-. 3oth, S. 



