BULLETIN No- 307. 



JULY, 1914 



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 ft. Above sea level, 2yj.^ ft. 

 Height of Wi?id Itistrumefits 72 ft. 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maximum reduced to freezing, 29 92, 30th, 9 p. 

 Minimum reduced to freezing, 29.36, 20th, A. 

 Reducedt maximum reading, 30.21, 30th, 9 p. 

 Reducedt minimum reading, 29.66, 20th, o A. 



Mean semi-daily reduced, 29.981 



Monthly range 0.55 



*Air Temperature. In Degrees Fahr. 



Highest 89.0, 13th, 3:30 p. 



Lowest, 45-0. ist, 4-30 A. 



Mean hourly, 67.7 



Mean of means of max. and niin., .... 68.6 



Mean sensible (wet bulb), 62 6 



Monthly range, 44.° 



Highest mean daily, 78.0, 17th 



Lowest mean daily 56-5. 3d 



Mean maximum, 78-5 



Mean minimum, 58.6 



Mean daily range, , 19-9 



Greatest daily range 33-o. 21st 



Least daily range, 6.0, 3d 



Humidity. 



Mean dew point, 60.0 



Mean force of vapor, " 663 



Mean relative humidity, ....... .80.7 



Precipitation, In inches. 



Total precipitation, 3-53 



Number of days on which .01 inch or more 



rain fell M 



♦Temperature in ground shelter. 

 1 Reduced to freezing and sea-level. 



Wind. 



Total movement, 3555ni. 



Greatest daily movement, .... 254m., 17th 



Least daily movement, 35m., 23d 



Mean daily movement, 115 m 



Mean hourly velocity, 4.8 m 



Maximum pressure per square foot, S.o lbs.= 



40m. per hour, 21st, 12 M., W.S.W. 

 Maximum velocity for 5 minutes, 30m. per 



hour, 2ist, 2P., W.S.W. 

 Prevaihng Direction, South. 



Summary. 



South 19 per cent. 



South Southwest 13" " 



SouthlSoutheast 13 " " 



Northwest 10 " " 



North Northeast 10 " " 



Other directions 35 " " 



Weather. 



Mean cloudiness observed, .... 69 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 221 hrs.=48 per cent. 



Number of clear days, 7 



Number of fair days, 16 



Number of cloudy days, 8 



Brjglit Sunsliine. 



Number of hours recorded, . . 241 hrs=52j(. 



Rain, 1st, 2d, 3d, 6th, 7th, gth, loth, nth, 



15th, 17th, 18th, 2ist, 23d, 28th, 29th, 30th. 



Tliunder and Lightning, 9th, nth, 12th, 



17th, iSth, 2ist. 



Gales, 35 or more miles per hour : 4oni, 21st, 



W.S.W. 



