BULLETIN No. 233. 



MAY, 1908. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Heii^ht of haro meter above ground, ^i ft. Above sea level, 2yj.^ ft. 

 Height of IVifid Instruments 72 ft. 



MONTHLY SUMMARY. 



Hreniture. In inciies. 



Maximum reduced to freezing, 30.02, 22d, 10 a 

 Minimum reduced to freezing, 28.90, ist,3 a. 

 Reducedl nia.ximum reading, 30.31, 22d, 10 A. 

 Reducedt minimum reading, 29.20, 1st, 3 A- 



Mean semi-daily reduced 29.955 



Montlily range i-ii 



*.!«• TPinitemtiire. In Degrees Fahr. 



Highest S8.5, 26th, 4 P 



Lowest, 33-5. 5th, 5 a- 



Mean liourly, .... 59-2 



Mean of means of max. and min., .... 59.9 



Mean sensible (wet bulb), 53 9 



Monthly range 55-o 



Higliest mean daily, 74.5,27th 



Lowest mean daily 437. 7th 



Mean maximum 7° 



.Mean minimum 4S.9 



Mean daily range, 21.3 



Greatest daily range 4i-o, nth 



Least daily range, 8.0, 7th 



Uiitnidity. 



Mean dew point, 5°' 



Mean force of vapor, 526 



Mean relative humidity 74. 8 



FrecipitatioH. In inches. 



Total precipitation, 4.35 



Number of days on which .01 inch or more 

 rain or melted snow fell 13 



* Temperature in ground shelter. 

 f Reduced to freezing and sea-level. 



lyind. 



Total movement, 58iSm. 



Greatest daily movement, . . . . 5i3ni., ist 



l,east daily movement 74ni., 15th 



Mean daily movement 18S m. 



Mean hourly velocity, 7.8 m 



Maximum pressure per square foot, 13.0 lbs. = 

 51 in. per hour, 2d, 6p., S. 



Maximum velocity for 5 minutes, 30 m. per 

 hour 1st, 10 A., S. W. 



Prevailing Direction, West. 

 Summary. 



Southwest 16 per cent 



West Southwest 13 " " 



Northwest, 13 " '" 



Southeast, 10 " " 



Northeast, 10 " " 



Other directions, 38 " " 



Weather. 



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



Total cloudiness recorded by the Sun Ther- 

 mometer, . . .171 hrs.=38 per cent. 



Number of clear days, 12 



Number of fair days, 13 



Number of cloudy days, 6 



Bright Siittahlne. 



Number of hours recorded, . . 2S2 hrs.=62K 

 Kain, 2d, 3d, 6th, 7th, 8th, gth, 12th, 13th, 



14th, 20th, 2ISt, 22d, 23d, 26th, 29th, 30th, 

 31st. 



Hail, 2d. 



Thunder and L iff Jitning— 2d, 22d, 26th. 



29th. 31st. 

 liight Frost, 5th. 



Qales, 35 miles or more per hour., 44 m. 

 ist. W. S. W.; 51 m., 2d., S.; 37 m.. loth, N. 

 W. ; 47 m., I2th, S. W.; 35 m., 13th, N. W. 



