BULLETIN No. 296. 



AUGUST, 1913 



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.j ft. 

 Height of Wind Itistruments 72 ft. 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maxiinuin reduced to freezing, 30 12, 20th, 8 A. 

 Miniimiin reduced to freezing, 29.40, 29th, 11 p. 

 Reduced! maximum reading, 



30.41, 20th, 8 A., 2ist, 7 A. 

 Reducedt minimum reading, 29.69, 29tli,ii p. 



Mean semi-daily reduced, 30.035 



Montlily range 0.72 



*Air Temperature. In Degrees Fahr. 



Highest, 97.0, 17th, 3 p. 



Lowest, 41.0, 26th, 6 A. 



Mean hourly, 69.5 



Mean of means of max. and min 69.9 



Mean sensible (wet bulb), 623 



Monthly range, 56 



Highest mean daily, 78.4, iSth 



Lowest mean daily, 61.8,25th 



Mean maximum, 83.5 



Mean minimum, 56.4 



Mean daily range, 27.1 



Greatest daily range, 43-°. 26th 



Least daily range, 11.5,29th 



Humidity. 



Mean dew point, 58. 6 



Mean force of vapor, 688 



Mean relative humidity, ....... .74-2 



Precipitation. In inches. 



Total precipitation, 2.26 



Number of days on which .01 inch or more 



rain fell • 10 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind, 



Total movement, 3441m. 



Greatest daily movement, .... 254ni., 22d 



Least daily movement, 27m., 3d, 31st 



Mean daily movement, mm 



Mean hourly velocity, 4.6 m 



Maximum pressure per square foot, 4.5 lbs.= 



30m. per hour, 22d, 4 p., S. 

 Maximum velocity for 5 minutes, 24m. per 



hour, 22d, 2?., S. 

 Prevailing Direction, Southwest. 



Summary. 



South 19 per cent. 



North Northeast 10 " 



West Northwest 13 " 



South Southwest 19 " 



West Southwest 10 " 



Other directions 29 " 



Weather. 



Mean cloudiness observed, . . . .41 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i47hrs.=34 per cent. 



Number of clear days, 13 



Number of fair days, 13 



Number of cloudy days, 5 



Bright Sunshine. 



Number of hours recorded, . . 2S2hrs=66!(. 



Rain, 2d, 4th, 6th, 7th, TOth, 13th, 14th, 17th, 



22d, 23d, 27th, 29th, 30th. 



Thunder and Liglitning, 4th, 27th, 29th, 



30th. 



Gales, 35 or more miles per hour : None. 



