UBKAKY OF THE 

 Massachus("t!s Agricultural College, 



AMHERST, Mass. 



BULLETIN No. 427. 



JULY. 1924 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGUICULTURAL EXPEllIMENT 



STATION. 



L:itit.ude, 42° 23' 48.5" N. Longitude 72* 31' 10" \V. 



Ueii^ht of luirometer above ground, ST ft. Above sea level, 2jj.s ft. 

 Height oj Wind Instruments J2 ft. Time used, 7§th Aler. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



M;ixin\iini reduced to freezing 29.94, 7th, 8 A. 

 Mininuini reduced to freezing, 29.22, 17th. 12M. 

 Reduced maximum reading, 30.23. 7th, S a. 

 Reduced minimum reading, 29.51, 17th, 12 M. 



Mean semi-daily reduced 29.948 



Monthly range 0.72 



Air TeniDerature. In Degrees Fahr. 



Highest 95-5. 29th, 4 p., 



30th, 0:30 P. 



Lowest 47.0, 26th, 6 A. 



Mean hourly 71. i 



Mean of means of max. and niin 71.4 



Mean sensible (wet bulb) 64.0 



Monthly range 48.5 



Highest mean daily 7S.7, 24th 



Lowest mean daily 62.3, ist 



Mean maximum 85.1 



Mean minimum 57.7 



Mean daily range 27.4 



Greatest daily range 41.5, 29th 



Least daily range 15.5,13th 



HamidKy. 



Mean dew point 60.4 



Mean force of vapor 735 



Mean relative humidity 73.5 



Precipitation. In inches. 



Total precipitation, in inches 1.75 



Number of days on which .01 inch or more 

 rain fell 4 



Wind. 



Total movement 341 2ni 



Greatest daily movement 198m, 17th 



Least daily movement 33m, 20th 



Mean daily movement iioni 



Mean hourly velocity 4.6ni 



Maximum pressure per square foot, 15.5 Ibs = 



56U1 per hour, 13th, i p., S.W. 

 Maximum velocity for 5 minutes, 42m per 



hour, 13th, I p., S.W. 

 Prevailing direction, Southwest. 



Summary. 



South Southwest 48 per cent 



Southwest 10 " " 



Northwest 10 " " 



West Northwest 10 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed .... 31 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 126 hours = 27 per cent. 



Number of clear days 16 



Number of fair days '4 



Number of cloudy days » 



Uriiiht Sunshine. 



Number hours recorded, 336 = 73 per cent. 

 Rain. 9th, loth, 13th, 17th, 22d, 24th, 25th, 



27th, 30th, 31st. 

 Thunder and Liiihtninit. 9th, 16th, 13th, 



17th, 30th, 31st. 

 Gales. 37m., ioth,S.S.W.;36ni., 13th, S.W.; 



45m. 17th, W. S. W.; 39m. 25th, S. W. 



