MONTHLY SUMMARY 



June, 1947 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.70, 1st 



Minimum 29.49, 16th 



Mean semi-daily 29.923 



Range 1.21 



Air Temperature, in degrees F. 



Highest 91, 28th 



Lowest 42, 4th 



Mean 64.6 



Range 49 



Highest mean daily 79.5, 30th 



Lowest mean daily 49.5, 8th 



Mean maximum 76.8 



Mean minimum 52.4 



Greatest daily range 38, 23rd 



Least daily range 7, 8th 



Precipitation, in inches 



Precipitation 3.22 



Snow — 



Maximum precip. in 24 hrs 1.06, 8th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 3698 



Greatest daily movement 228, 3rd 



Least daily movement 53, 28th 



Mean hourly velocity 5.1 



Maximum velocity 25, 12th, 22nd 



Wind, direction 



Prevailing direction SSW 



North, days 3 



Northeast, days 3 



East, days 



Southeast, days 4 



South, days 11 



Southwest, days 1 



West, days 2 



Northwest, days 6 



Weather 



Mean relative humidity, percent 68.5 



Mean cloudiness, percent 31.3 



Number of clear days 15 



Number of fair days 10 



Number of cloudy days 5 



Number of hours bright sunshine 305 



Percent of possible hours of 



bright sunshine 66.7 



Thunder and lightning, 3rd, 14th, 19th, 22nd 



30.30 



29.55 



29.95 



0.75 



91.2 

 40.0 



65.7 

 51.3 



3.75 

 11 



3585 



5.0 



24.6 



WSW 



66.9 



51.1 

 10 

 12 



8 

 257 



54.0 



30.54, 1889 

 29.24, 1902 



101, 1919 

 34, 1891 



9.68, 1922; 0.76, 1908 

 17, 1922, 1945; 4, 1908 



4571, 1908; 1409, 1906 

 48, 1939 



71, 1903; 28, 1908 



22,1908,1941,1943; 1, 1927 



23, 1912; 3, 1941 



22, 1903; 1, 1923 



362, 1908; 102, 1903 



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 1946. 



