METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground^Slft. Above sea level, 278.5 ft. ** 



BULLETIN No. 102. 



JUNE, 1897. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 29.98, 7th, IOp. 

 Minimum reduced to freezing, -29. 3.5, 30th, 2 P. 

 Reducedt maximum reading, 30.28, 7ih, 10 p. 

 Reduced! min. reading, . 29.63, J-ith,30th,2 p. 



Mean reducedt, 29.901 



Monthly range, 0.651 



*A.ir Temperature. In Degrees Falir. 



Highest 85.5; 25th 



Lowest 38.0, 2d 



Mean, 61.8 



Mean of means of max. and min., .... fi2.0 



Mean sensible(wet bulb) 57 



Monthly Range 47.5 



Highest mean daily, . 72.8,25th 



Lowest mean daily 49.6, 1st 



Mean maximum, 73.3 



Mean minimum 50.7 



Mean daily range, 22.6 



Greatest daily range 33.0, 19th 



Least daily range, 9.0, 7th,9th, 10th 



Humidity. 



Mean dew point, 53.3 



Mean force of vapor, 600 



Mean relative humidity 73.3 



Wind. 



Prevailing Direction, West South West. 



Summary. 



South West, 10 per cent. 



West, 17 " " 



North 13 " " 



South 23 " " 



Other directions, 37 " " 



Total movement 4208 m. 



Greatest daily movement 272 m., .3d. 



Least daily movement, 39m., 14th. 



Mean dally movement, 140.3 m. 



Mean hourly velocity, . 5.8 m. 



Maximum pressure per square foot, 7.0 lbs.= 

 37 m. per hour, 11.30 a. 1st, W.N.W. 



Precipitation. In inches. 



Total precipitation 6.65 



Number of days on which .01 inch or more 

 rain or melted snow fell, 11 



Weather. 



Mean cloudiness observed, ... 47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 209.0 hours or 46 per cent. 



Number of clear days 8 



Numberof fair days 11 



Number of cloudy days 11 



Mright Sunshine. 



Number of Hours recorded, 248 hours or 549( 



iJam, 3a, 4th, ."Jth, Sth, 9th, lOth, 12th, 13th, 

 14th, 15th, 2Uth, 29th, 30th. 



Gales, ot 35 or more miles per hour, 37m., 

 1st, W.N.W. ; 36m., 3d, S.S.W.; 35m., 

 2Ist,W.N.W.; .36m., 22d, S.VV. 



Thunder and Lightning, 3d, 4th, 9th, 13th. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



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



