BULLETIN No. 284. 



AUGUST, 1912 



Meteorolodcal Observations 



o 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



Latitude, 42° 23' 48.5" N. Longitude 72° 31' lo" W. 



Meig/it of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxiiuuin reduced to freezing, 29 99, 17th, 8 a. 

 Mininmin reduced to freezing, 29,24, 23d, 12 m. 

 Reduced) niaxiimim reading, 30.29, 17th, S A. 

 Reduced f minimum reading, 29.52, 23d, 12 m. 



Mean semi-daily reduced, 29-948 



Montlily range 0.77 



•.\ir Temperature. In Degrees Fahr. 



Highest, S9.0, 14th, 3 P. 



Lowest 39-0. 3ist, 5:30 A. 



Mean hourly, • 66.4 



Mean of means of max. and min 66.4 



Mean sensible (wet bulb), 61. i 



Monthly range 50-o 



Highest mean daily, 78. i, 14th 



Lowest mean daily, 53o< S'st 



Mean maximum, 77.5 



Mean minimum, 55-3 



Mean daily range 22.2 



Greatest daily range, SS-o. 17th 



I-east daily range, 5-5> iSth 



Humidity. 



Mean dew point SS-i 



Mean force of vapor 638 



Mean relative hnmidity, ....... .78.3 



Precipitation. In inches. 



Total precipitation, 3-22 



Number of days on which .01 inch or more 

 rain fell ' " 



•Temperature in ground shelter, 

 t Reduced to freezing and sea- level. 



Wind. 



Total moveinent 3698m. 



Greatest daily movement 236ni., nth 



Least daily movement 35ni.. 2d 



Mean daily movement, 119 m 



Mean hourly velocity, 5.0 m 



Maximum pressure per square foot, 6.5 lbs.= 



36m. per hour, 23d, i P., W.N.W. 

 Maximum velocity for 5 minutes, 30 ni. per 



hour, 23d, IP., W.N.W. 

 Prevailing Direction. West. 



Summary. 



West 19 per cent 



Northwest . 19" " 



Southwest 13 " " 



West Northwest 10 " 



Other directions 39 " " 



Weather. 



Mean cloudiness observed, . ■ . .50 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 191 hrs.=44 per cent. 



Number of clear days i 



Number of fair days, 25 



Number of cloudy days, 5 



Bright Sunshine. 



Number of hours recorded. . . 23S hrs. = 56* 



Rain, ist, 3d, 9th, loth, nth, iSth, 19th, 20th, 



22d, 23d, 26th, 31st. 



Thunder and Lishtning, 3d, nth, 26th. 



Liiglit Frost, 31st. 



Gales, 35 or more miles per hour : 36 m, 23d, 



W.N.W. 



•1 



