MONTHLY SUMMARY 



June 1939 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.26, 3rd, 27th 



Minimum 29.63, 30th 



Mean semi-daily 29.980 



Range 0.63 



Air Temperature, in degrees F. 



Highest 90, 11th. 



Lowest 42, 7th, 



Mean 66.7 



Range 48 



Highest mean daily 78.5, 11th 



Lowest mean daily 54.5, 17th 



Mean maximum 77.7 



Mean minimum 55.7 



Greatest daily range 37, 7th 



Least daily range 7, 17th 



Precipitation, in inches 



Precipitation 3.21 



Snow 



Max precipitation in 24 hrs 80, 17th 



Number of days with 01 or more 12 



Wind, in miles 



Total movement 3443 



Greatest daily movement 261, 16th 



Least daily movement 45. 27th 



Mean hourN; velocity 4 8 



Maximum velocity 48, 17th 



Wind, direction 



Prevailing direction WSW 



North, days 4 



Northeast, days 



East , days 



Southeast, days 1 



South, days 9 



Southwest, days 5 



West , days 7 



Northwest, days 4 



Weather 



Mean relative humidity, percent 69 1 



Mean cloudiness, percent 60 



Number of clear days 12 



Number of fair days 11 



Number of cloudy days 7 



Number hours bright sunshine 254 



Percent of possible hours of bright 



sunshine 55.6 



Thunder and lightning. .1, 11, 13, 17, 24, 25 

 Last frost May 16 



Normal 



Extremes 



30.30 

 29.55 

 29.94 



0.75 



91.2 

 40.0 



65.7 

 51 3 



3 51 



11 



3585 



50 

 24.6 



WSW 



66 9 



51.1 

 10 

 12 

 8 



257 



54.0 

 May 12 



30.54, 1889 

 29.24, 1902 



101, 1919 

 34, 1891 



9.68, 1922; 0.76, 1908 



17, 1922;4, 1908 

 4571, 19.:8; 1409, 1906 



40, 1932 



71, 1903; 28, 1908 



22, 1908; 1, 1927 



23,1912;4, 1895, 1903 



22, 1903; 1, 1923 



362, 1908; 102, 1903 



June 8,1932; Apr. 23, 1904 



Note — The first column in the above summary gives observations made during the 

 month. The second column gives the averages based on observations made from 

 1889 to 1938, except that humidity records are based on observations made from 

 1929 to 1938. The third column gives extremes observed from 1889 to 1938. 



