BULLETIN No. 478. 



OCTOBER, 1928 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGEICULTURAL EXPERIMENT 



STATION. 



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



Height of Ihirometer above ground, 36 ft. Above sea level, 2^j.^ ft. 

 Height oj Wind Instruments dj ft. Time used, y^thAIer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, 30.26, 30th, 10 a 

 Minimum reduced to freezinji, 29.27, 24th, 2P 

 Reduced maximum reading, 30.55, 30th, 10 A 

 Reduced minimum reading, 29.55, 24th, IP 



Mean semi-daily reduced 30.110 



Monthly range i.oo 



Air Temperature. 



In DegTees Fahr. 



Highest 86.0, 12th, 3 p 



Lowest 19.5, 30th, 6-30 A 



Mean hourly 51. i 



Mean of means of max. and min 51 



Mean sensible (wet bulb) 46.2 



Monthly range 66.5 



Highest mean daily 70.3, iSth 



Lowest mean daily 29.0,30th 



Mean maxinuim 64.6 



Mean minimum 39 3 



Greatest daily range 41.0, 15th 



Least daily range lo.o, 20th 



Humidity. 



Mean dew point 42.9 



Mean force of vapor 3S4 



Mean relative humidity 79.2 



Precipitation. In inches. 



Total precipitation, in inches 



Number of days on which .01 inch or more 

 rain fell 



Wind. 



Total movement 4512m 



Greatest daily movement 3oini, 20th 



Least daily movement 43m, 4th 



Mean daily movement 145.6m 



Mean hourly velocity 6.1m 



Maximum pressure per square foot, 6.5 lbs = 



36m per hour, iSth, 4?. 23rd, 3 p. 

 Maximum velocity for 5 minutes, 32m per 



hour, gth, bp. 



Prevailing direction. South Southwest 

 Summary. 



South 32 per cent 



Southeast 16 " " 



West 13 " " 



Northwest 13 " " 



West Northwest 10 " " 



Other directions 16 " " 



Weather. 



Mean cloudiness observed .... 34 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 174 hours = 51 per cent 



Number of clear days 7 



Number of fair days 12 



Number of cloudy days ' . . 12 



Bright Sunshine. 



Number hours recorded. 167= 49 per cent. 

 Rain. 5th, i6th, iSth, 20th, 23rd, 25th, aSth. 



Thunder and Lightning, None. 



Gales, 36m., i8th. E.S.E., 36m., 23rd. S.S.E. 



