METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



BULLETIN No. I 16. 



AUGUST, 1898. 



MONTHLY SUMMARY. 



Preasiwe. In inches. 

 Maximum reduced to freezing, 29.07, 28tli,9A. 

 Minimum reduced to freezing, -29.38, 2.'itli, 7p. 

 Uediicedf maximum reading, 30.26, 28th, 9a. 

 Reilucedf min. reading, .... 29.66, 25th, 7P. 



Mean reduced f 29.959 



Monthly range, 60 



*Air Temperature. In Degrees Fahr. 



Highest 91.0, 24th, 1 P. 



Lowest 44.5, 28th, 5A. 



Mean 69.7 



Mean of means of max. and min., .... 70.2 



Mean sensil)le(wet bulb), 66.9 



Monthly Range, 46.5 



Highest mean daily, 75.8, 2d 



Lowest mean daily 60.4, 28th 



Mean ma.ximum, 80.6 



Mean minimum 59.8 



Mean daily range 20.8 



Greatest daily range 35.0, 14th 



Least daily range, 7.5, 10th 



Hutnidity. 



Mean dew point 64.6 



Mean force of vapor 781 



Mean relative humidity 82.1 



Wind. 

 Prevailing Direction, South West. 

 Summary. 



South South West, 26 per cent. 



South 23 " " 



South West 13 " " 



West, 9 " " 



Other directions 29 " " 



Total movement 3111 m. 



Greatest daily movement, . . . 202 m., 29th 



Least daily movement, 18 m., 14th 



Mean ilaily movement 100 m. 



Mean hourly velocity, 4.2 m. 



Ma.ximum pressure per squai'C foot, 13.0 lbs = 

 51m. per hour, 23d. 6 p., N. W. 



Precipitation. In inches. 



Total precipitation, 6.85 



Number of days on which .01 inch or more 



rain or melted snow fell, 15 



Weather. 

 Mean cloudiness observed, . . 60.0 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . .228 hours or 53.0 per cent. 



Number of clear days, 5 



Number of fair days 14 



Number of cloudy days, 12 



Bright Sunshine. 



Number of Hours recorded, 201 hours or 4754 



Rain, 1st, 4th, 5th, 7th, 8th, 9th, 10th, 11th, 



12th, 13 th, 10th, 17th, 18th, 19th, 23d, 24th, 



25th, 26th. 



Thunder and lightning, 3d, 7th, 8th, 16th, 



17th, 19th, 23d, 24th. 

 Oales, of 35 or more miles per hour, 35m., 

 17th, N.E.; 51m., 23d,N.W. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



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



