METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



BULLETIN No. 104. 



AUGUST, 1897. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 29.89, 21st,7 A. 

 Minimum reduced to freezing, •29.'28, 11th, 5 P. 

 Reilucedf maximum reading, 30. IS, 21st, 7 A. 

 Reilucedf min. reading, . . . 29.57, 11 th, 5 P.' 



Mean reducedf, 29.943 j 



Montlily range 0.61 1 



*Air Temperature. In Degrees Fahr, 



Highest 85.; Sd, 4t)i 



Lowest, 42., 21st 



Mean, CG. 



Mean of means of max. and min., . . . .66.8 



Mean sensiljle(wet bulb), 62.7 



Monthly Range 43. 



Highest mean daily 72.7,4th 



Lowest mean daily AG.S, 24th 



Mean maximum, 77.5 



Mean minimum 56.1 



Mean daily range, 21.4 



Greatest daily range, 33.5, 21st 



Least daily range 6.5,24th 



Humidity. 



.Mean dew point, f'9.7 



Mean force of vapor 676 



Mean relative humidity, 79.6 



Wind. 



Prevailing Direction, South South West. 

 Summary. 



South 29 per cent. 



South Southwest, 13 " 



West South Wett 10 " 



South West, 10 " 



South South East, 10 " 



Other directions, 28 " 



Total movement 3452 m. 



Greatest daily movement, . . . 184 «., 16th 



Least daily movement, 43 m., 7th 



Mean daily movement 111.4 m. 



Mean hourly velocity, . 4.6 m. 



Maximum pressure per square foot, 14 lbs.= 

 5:i m. per hour, 4 p., 15th, S.S.W. 



Precipitation. In inches. 



Total precipitation 4.29 



Numl)er of days on which .01 inch or more 

 rain or melted snow fell, S 



Weather. 



Mean cloudiness observed, ... 42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 155.0 hours or 36 per cent. 



Number of clear days 8 



Number of fair days 15 



Number of cloudy days 8 



Bright Sunshine. 



Number of Hours recorded, 274 hours or 645( 

 Bain, 4th, 5th, 9th, 10th, 11th, 12th, 15th, 



16th, 18th, 22d, 24th. 

 Gales, of 35 or more miles per hour, .38ni., 



12tb,W.N.W. ; 53 m., 15th, S.S.W. ; .36 m., 



22<l, S.S.W. 

 Thunder and Lightning, 15th, 22cl. 

 Hail, 22d. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



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



