MONTHLY SUMMARY 



June 1940 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.30, 17th 



Minimum 29.47, 29th 



Mean .semi-daily 29.903 



Range 0.83 



Air Temperature, in degrees F. 



Highest 89, 4th, 5th 



Lowest 39, 22nd 



Mean 64.6 



Range 60 



Highest mean daily 77, 13th 



Lowest mean daily 53.5, 21st 



Mean maximum 75.4 



Mean minimum 53.8 



Greatest daily range 37, 7th 



Least daily range 3, 10th 



Precipitation, in inches 



Precipitation 2.46 



Maximum precipitation in 24 hrs 49, 



24th, 25th 



Number of days with .01 or more 13 



Wind, in miles 



Total movement 3894 



Greatest daily movement 269, 6th 



Least daily movement 40, 11th 



Mean hourly velocity 5.4 



Maximum velocity 32, 20th 



Wind, direction 



Prevailing direction W 



North, days 4 



Northeast, days 1 



East, days 



Southeast, days 



South, days 5 



Southwest, days 3 



West, days 8 



Northwest, days 



Weather 



Mean relative humidity, percent 72 



Mean cloudiness, percent 57 



Number of clear days 13 



Number of fair days 9 



Number of cloudy days 8 



Number hours bright sunshine _ 261 



Percent of possible hours of bright 



sunshine 57. 1 



Thunder and lightning 4th, 5th, 



13th, 15tli, 19th, 27th, 28th, 29th. 



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; 4, 1908 

 4571, 1908; 1409, 1906 



48, 1939 



71, 1903; 28, 1908 



22, 1908; 1,1927 



23, 1912; 4, 1895, 1903 



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 1939. 



