METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiraent Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of mstruments above ground, 51ft. Above sea level, 273.5 ft. ** 



BULLETIN No. I 15. 



JULY, 1898. 



MONTHLY SUMMARY. 



Preasnre. In inches. 

 Maximum reduced to freezing, 30.14, 12tli,7A. 

 Minimum reduced to freezing, 29..'5r), 9tli, '2p. 

 Reducedt maximum reading, 30.44, 12th, 7A. 

 Kcducedf min. reailing, . . . . 2!t.()3, 9th, 2p. 



Mean red need t, 30.017 



Montldy range 81 



*Air Teniperatttre. In Degrees Fahr. 



Highest, 9(i.5, 3d,3P. 



Lowest 40.0, nth, .5a 



Mean 70. i 



Mean of means of ma.x. and min., .... 70.9 



Mean sensiljle(\vct l)ulh) G7.4 



Monthly Range, 50.5 



Higliest mean daily, 81.6, 3d 



Lowest mean daily 56.9, 13th 



Mean maximum -82.5 



Mean minimum 59.3 



Mean ilaily range 23.2 



Greatest daily range, 37.5, 17tli 



Least daily range 7.0, l;ith, 2Sth 



Hutnidlty . 



Mean dew point, 64.6 



Mean force of vajior 822 



Mean relative humidity, 79.3 



Wind. 

 Prevailing Direction, .South West. 

 Summary. 



South South West, 26 per cent. 



South 22 " " 



South West, 13 " " 



West 13 " " 



Other <lirection8 20 " " 



Total movement 3377 m. 



Greatest daily movement, . . . 231 m., 15th 



Least daily movement 30m., Uth 



Mean daily movement, 109 m. 



Mean hourly velocity, 4.5 m. 



AL'iximum pressure per square foot, 17.5 Ibs^ 

 59m. per hour, 30th. 2 P., S. W. 



Precipitation. In inches. 



Total precipitation 4.09 



Number of days on which .01 inch or more 

 rain or melted snow fell 10 



Weather. 



Mean cloudiness observed, . . 53.0 per cent. 



Total cloudiness recorded by the Sun Ttier- 



mometer, . . . 226 hours or 49.0 per cent. 



Number of clear days 6 



Number of fair days, 11 



Number of cloudy days 14 



Bright Sunshine. 



Numl)er of Hours recorded, 2.36 hours or 51?i 

 Rain, 4th, 9th, 13th, ISth, 19th, 21.st, 26th, 27tli, 



2Hth,29th,30th,3Ist, 

 Thunder and lightnin{/,ith, 18th,19th,29th, 



30th, 31st. 

 Gales, of 35 or more miles per hour, 59m., 



30th, S.W. 



• Temperature in ground shelter. 



t Ueilucedto freezing an<l sea level. 



* * Determined from levels of B. & M. R. R. 



