BULLETIN No. 245. 



JUNE, 1909. 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGKICULTUKAL EXPERIMENT 



STATION . 



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



Height of barometer above ground, 31 ft. Above sea level, 2yj.^ ft. 

 Height of IVi/iii Instruments 72 ft. 



MONTHLY SUMMARY. 



I^reasure. In inches. 



Maximum reduced to freezing, 29.97.8th, 9 A. 

 Minimum reduced to freezing, 29.29, 18th, 3 A. 

 Reduced* maximum reading, 30.26, Sth, 9 A. 

 Reducedt minimum reading, . 29.58, i8th, 3 A. 



Mean semi-daily reduced, 29.966 



Montlily range, 0.6S 



*Air Teinpernture. In Degrees Falir. 



Highest, 91.5, 2;th, 3 p. 



Lowest, 40.0, 9th, 6 A. 



Mean liourly, 66.4 



Mean of means of max. and min., .... 66.1 



Mean sensible (wet bulb), 60.8 



Monthly range, 51.5 



Highest mean daily, 79.9, 25th 



Lowest mean daily, 52.6, 9th 



Mean maximum, 78.4 



Mean minimum, 53.8 



Mean daily range, 24.6 



Greatest dally range, 35.5, ist 



Least daily range, 9.0, 5th 



Bnmldity, 



Mean dew point, 56.6 



Mean force of vapor, 668 



Mean relative humidity 73.6 



Precipitation. In inches. 



Total precipitation, 2.24 



Number of days on which .01 inch or more 

 rain or molted snow fell '12 



• Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



lotal movement, 4225m. 



Greatest daily movement, .... 280m., i8th. 



Least daily movement, 53iii.. 3d. 



Mean daily movement i4ini. 



Mean hourly velocity, 5-9 ni . 



Maximum pressure per square foot, 7.0 lbs.= 



37 m. per hour, i8th, 4 p., WNW. 

 Maximum velocity for 5 minutes, 30m. per 



hour i8th, 4 p., WNW. 

 Prevailing Direction, West Northwest. 



Summary. 



West Northwest 20 percent. 



West 17 " " 



Southwest 13 " " 



Northeast 10 " " 



Other directions, 40 " " 



Weather. 



Mean cloudiness observed, . • . .44 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i57hrs.=34 per cent. 



Number of clear days, 12 



Number of fair days, 16 



Number of cloudy days, 2 



Bright Snn»hine. 



Number of hours recorded, . . 300 hrs.=66^ 

 Kain, 2d, 4th, 5th, 6th, 9th, loth, nth, 



13th, 14th, 15th, 17th, iSth, 22d, 24th, 



28th. 

 Thunder and Lightning:, loth, 14th. 

 Gales, 35 miles or more per honr ; 37m. 

 i8th, W.N.W. 



