BULLETIN No. 260. 



AUGUST, I9IO 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



i'reasure. In inches. 



Maximum reduced to freezing, 3008, 30th, iip. 

 Minimum reduced to freezing, 29,27, 4th, 4 p. 

 Reduced! maximum reading, 30.37, 3otli, 11 p. 

 Keducedt minimum reading, . 29.55, 4*^^, 4 P. 



Mean semi-daily reduced, 30.071 



Montlily range, 0.82 



*.4.ir Temperature. In Degrees Falir. 



Higliest 85.5. 14th, 3 P- 



Lowest, 4I-0, 27th, 6 a. 



Mean hourly, 67.1 



Mean of means of max. and min 67.1 



Mean sensible (wet bulb), 60.9 



Monthly range, 44-5 



Highest mean daily, 71.8,15th 



Lowest mean daily 5^.2, 27th 



Mean maximum, 78-8 



Mean minimum, 55-4 



Mean daily range 23.4 



Greatest daily range, 36-5, 28th 



Least daily range, 10.5, i6th 



Hutnidity. 



Mean dew point, 57-4 



Mean force of vapor 639 



Mean relative humidity, 76.3 



Precipitation. In inches. 



Total precipitation, 4-o3 



Number of days on which .01 inch or more 



rain fell, '7 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4271 ni. 



Greatest daily movement, .... 260m., 26th. 



Least daily movement 6im., 27th. 



Mean daily movement, i3Sm. 



Mean hourly velocity, 5-7 m- 



Maximum pressure per square foot, 8.5 lbs.= 



41m. per hour, 4th, 6p., W. N. W. 

 Maximum velocity for 5 minutes, iSm. per 



hour 25th, 5P., S.S.W. 

 Prevailing Direction, South Southwest. 



Summary. 

 South Southwest 23 per cent. 



South 19 " " 



East Southeast 10 " " 



Southwest 10 " " 



West 10 " " 



West Northwest 10 " " 



Other directions 18 " " 



Weather. 



Mean cloudiness observed, . ■ . .47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 2oohrs.=47 per cent. 



Number of clear days, 14 



Number of fair days, 15 



Number of cloudy days, 2 



Bright Sutiahine. 

 Number of hours recorded, . . 229 hrs. = 53^ 

 Rain, 2d, 3d, 4th, 5th, loth, nth, i8th, 19th, 



26th. 

 Gales, 35 or more miles per hour : 41 m, 4th, 



W.N.W. 

 Thunder and Lightning, 4th. 



