BULLETIN No. 225. 



SEPTEMBER, 1907. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Hressure. In inches. 



Maximum reduced to freezing, 30.09, 14th, 8 A. 

 .Minimum reduced to freezing, 29.20, 24tli, 3 p. 

 Reducedl maximum reading, 30.39, 14th, 8 a. 

 Reducedt minimum reading, 29.4S, 24th, 3 p. 



Mean semi-daily reduced 30.015 



IMontlily range, 0.91 



*Air 'Venipertitiire. In Degrees Fahr. 



Highest, 85 o. ifith, I P-; 2'st, i;3o 1* 



Lowest 36.0, 27th, 3 A. 



Mean liourly, 61.3 



Mean of means of max. and min 62.0 



Mean sensible (wet bulb), 57.1 



Monthly range, 49-o 



Highest mean daily, 71.7, 16th 



Lowest mean daily, 46.5,29th 



Mean maximum, 70-7 



Mean minimum, 53-4 



Mean daily range, i7-3 



Greatest daily range, 3S-o, 13th 



Least daily range 3.0,23d 



Hniniditn. 



Mean dew point, 54-6 



.Mean force of vapor, 536 



Mean relative humidity 83.0 



Precipitation. In inches. 



Total precipitation, 8.74 



Number of days on which .01 inch or more 



rain or malted snow fell, 13 



* Temperature in ground shelter. 

 t Keduced to freezing and sea-level. 



trind. 



Total movement, 35S2ni. 



Greatest daily movement, . . . . 253 m., 24th 



Least daily movement, 32m., loth 



Mean daily movement iigm. 



Mean hourly velocity, 5.0m. 



Maximum pressure per square foot, 6.0 lbs.= 



35 m. per hour, nth, 7 p., S. 

 Maximum velocity for 5 minutes, 30 m. per 



hour 2Sth, 3 p., S.S.W. 

 Prevailing Direction, South Southwest. 



Summary. 



South, 13 per cent. 



Northwest, 10 " " 



South Southeast, 23 " " 



West Northwest 13 " " 



Other directions, 41 " " 



IVenther. 



Mean cloudiness observed, - . . 64 per cent. 

 Total cloudiness recorded by the Sun 'i'her- 



monieter, . . 263hrs.=7i per cent. 



Number of clear days, 2 



Number of fair days, 9 



Number of cloudy days, 19 



liriglit Sunshine. 

 Number of hours recorded, ■ • no hrs. = 29S 

 K«m, 2d, 3d, 4th, 5th, 9th, loth, nth, 17th, 



17th, i8th, 2ist, 23d, 24th, 27th, 2Sth,. 29th. 



Gales, 35 miles or more per hour, 35m. ilth,S. 

 Thunder and Lightning, 3d. 4th, 5th, 



nth, 2ist, 24th. 

 Frost, very light, 27th. 



