BULLETIN No. 258. 



JUNE, 1910 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments ^2 ft. 



MONTHLY SUMMARY. 



Preasure. In inches. 



MaxiHiuin reduced to freezing, 2g 94, 26th, 6 A. 

 Miuinium reduced to freezing, 29.11, ist, 4 A. 

 Reducedl maximum reading, 30.24, 26th, 6 A. 

 Reducedt minimum reading, . 29.41, ist, 4 A. 



Mean semi-daily reduced, 29.920 



Montlily range 0.S3 



*Air Temperature. In Degrees Falir. 



Highest S8.o,i5th, 3 P.; 21st, 3 p- 



Lowest 35-0. 5th, 5 A- 



Mean liourly, 63.8 



Mean of means of max. and min., .... 63.7 



Mean sensible (wet bulb), 58.8 



Monthly range, 53-° 



Highest mean daily 75.7, 22d 



Lowest mean daily, 5o-9. is* 



Mean maximum, 74-5 



Mean minimum, 52.9 



Mean daily range, 21.6 



Greatest daily range, 32-0, 3d 



Least daily range, 4.0,11th 



Hiitnidity. 



Mean dew point, 55-2 



Mean force of vapor, 607 



Mean relative humidity, 75-4 



Precipitation. In inches. 



Total precipitation, 2.65 



Number of days on which .01 inch or more 

 rain or melted snow fell, • 10 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3685m. 



Greatest daily movement, .... 243m., 4th. 



Least daily movement 49m., 12th. 



Mean daily movement i23ni. 



Mean hourly velocity, 5.1 m. 



Maximum pressure per square foot, 4.0 lbs.= 



28m. per hour, 4th, 6a., N. N. W. 9th, 



5P.,S. W. 

 Maximum velocity for 5 minutes, 28m. per 



hour 4th, 4P., S.W. 

 Prevailing Direction, West. 

 Summary. 



West 17 percent. 



North Northeast 13 " " 



North Northwest 13 " " 



South Southwest 10 " " 



Northwest 10 " " 



Other directions, 37 " " 



Weather. 



Mean cloudiness observed, . . . .59 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i78hrs.=39 per cent. 



Number of clear days, 8 



Number of fair days, 16 



Number of cloudy days 6 



Bright Sunshine. 

 Number of hours recorded, . . 279 hrs.==6i^ 

 Rain, ist, 5th, 9th, loth, nth, 12th, 16th, 17th, 

 18th, 24th, 27th, 28th. 

 Lightning, 9th, 23d. 

 Gales, none. 



