METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, -12° 23' 48.5" N. Longitude, 72° 31' 10" VV. 



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



BULLETIN No. I 14. 



JUNE, 1898. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reiluced to freezing, 30.05, 16tIi,7A. 

 Minimum reduced to freezing, 29.12, 25th, 5p. 

 Heducedf maximum reading, 30.35, 16th, 7a. 

 Keducedt min. reading, .... 29.40,25th, 5p. 



Mean reducedt, .... 29.947 



Montlily range .95, 



*Air Temperature. In Degrees Falir. 



Highest 89.5, 25th, 3 v. 



Lowest, 39.5, Kjth, 5a 



Mean G6.6 



Mean of means of max. and min. 60. 1 



Mean sensible(\vet Ijulh), 62.5 



Monthly Range, 50.0 



Highest mean daily, 76.1,25th 



Lowest mean daily, 55.2, 22ii 



Mean maximum 77.3 



Mean minimum 55. 



Mean daily range, 22.3 



Greatest daily range 31.0, 17th 



Least daily range S.O, 4th, 19th 



Humidity. 



Mean dew point, 59.3 



Mean force of vapor, 700 



Mean relative humidity, 77.1 



Wind. 



Prevailing Direction, West South West. 

 Summary. 



Northwest 13 percent. 



South 20 " " 



West 10 " " 



South West 10 " " 



South South West 10 " " 



North East, 10 " " 



North North East, 10 " " 



Other directions, 17 " " 



Total movement 4102 m. 



Greatest daily movement, ... 314 m., 4th 



Least daily movement 33 m., 16th 



Mean daily movement 138.7 m. 



Mean hourly velocity, 5.8 m. 



Maximum pressure per square foot, 8.5 lbs = 

 41 m. per hour, 1 P., 15th. 



Precipitation. In inches. 



Total precipitation, 3.09 



Number of days on which .01 inch or more 



rain or melted snow fell is 



Weather. 

 Mean cloudiness observed, . . 57.0 per cent. 

 Total cloudiness recorded by the Sun Tlier- 



mometer, ... 187 hours or 41.0 per cent. 



Number of clear days 5 



Numberof fair days, jg 



Number of cloudy days 7 



Bright Sunshine, 

 Number of Hours recorded, 270 hours or 5% 

 Rain, 2d,3d,4th, 6th, Sth, 11th, 12th, 13th, 14th, 



18th,19th,20th,21st,22d,25th,28th. 

 Thunder and lif/htnin>j, 6tli, Sth, 12th, I3tli, 



14th, 22d, 2.5th. 

 Gales, ot 35 or more miles per hour, 37ni. ,4th, 



N.E.;41m.,15th,N.N.E.; 40m., 18th, S.W.; 

 ' 40m., 26th, S.W. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



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



