BULLETIN No. 320. 



AUGUST. 1915 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 fi- Above sea level, 2"/^.^ ft. 

 Height oj Wifid histruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 2998, 3d, 10 p. 

 Minimum reduced to freezing, 2g.4o,2Sth, 8 A 

 Reducedt maximum reading, 30.28, 3d, 10 p 

 Reduced! minimum reading, 29.69, 25th, 8 A 



Mean semi-daily reduced, 29.978 



Montlily range 0-59 



*Air Temperature. In Degrees Fahr. 



Higliest, SS.o, ist, I p., 13th, 4 p 



Lowest, 42.0, 27tli, 6 a 



Mean liourly, 66.0 



Mean of means of max. and min., .... 67.0 



Mean sensible (wet Ijulb), 62 



Monthly range 46.0 



Highest mean daily, 76.7, ist 



Lowest mean daily, 55.6, 27th 



Mean maximum, 76.6 



Mean minimum, 57.3 



Mean daily range, i9-3 



Greatest daily range, 29.5, nth 



Least daily range, 7-o, 4th, 29th 



Humidity. 



Mean dew point 60.4 



Mean force of vapor 635 



Mean relative humidity, . S5.0 



Precipitation. In inches. 



Total precipitation, 8. 28 



Number of days on which .01 inch or more 

 rain fell 14 



♦Temperature in ground shelter. 

 I Reduced to freezing and sea-level. 



Wind. 



Total movement 3199™. 



Greatest daily movement, .... 250111., 26th 



Least daily movement, 41111., 20th 



Mean daily movement, looni. 



Mean hourly velocity, 4.2 111. 



Maximum pressure per square foot, 9.5 lbs.= 



44"i- per hour, Sth, 2P., S.S.E. 

 Maximum velocity for 5 minutes, 42ni. per 



hour, 4th, 2P., E. 

 Prevailing Direction, West Southwest. 



Summary. 



Northwest 13 per cent. 



South 13 " " 



West 10 " " 



Northeast 10 " " 



Other directions 54 " " 



Weather. 



Mean cloudiness observed, . . . . 63perceiit. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 277 hrs.=65 per cent. 



Number of clear days, 



Number of fair days, 16 



Number of cloudy days, 15 



Bright Sunshine. 



Number of hours recorded, . .152 Iirs.=35?{. 

 Rain, ist, 2d, 3d, 4th, 5th, 6th, Sth, 9th, 



loth, 13th, 15th, 16th, 2ist, 22d, 2;th, 29th, 



30th, 

 Thunder and I-ightning:,ist, 9th, 15th, 22d. 

 Hail, 9th. 



Gales, 35 or more miles per hour : 39m., 4th, 

 E.; 44ni-, Sth, S.S.E.; 36m , 19th, N.N.W. 



