MONTHLY SUMMARY 



July 1940 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.34, 6th 



Minimum 29.73, 1st 



Mean semi-daily 30.029 



Range 0.61 



Air Temperature, in degrees F. 



Highest 94, 26th 



Lowest 46, 3rfl 



Mean 70.6 



Range 48 



Highest mean daily 83, 26th 



Lowest mean daily 58, 12th 



Mean maximum 82.4 



Mean minimum 58.7 



Greatest daily range 35, 7th, 15th 



Least daily range 6, 12th 



Precipitation, in inches 



Precipitation 4.69 



Maximum precipitation in 24 hrs. 1.18, 18th 



Number of days with .01 or more 15 



Wind, in miles 



Total movement 2869 



Greatest daily movement 164, Is; 



Least dai.y movement 54, 2fth 



Mean hourly velocity 3.9 



Maximum velocity 28, 9th 



Wind, direction 



Prevailing direction \\ 



North, days 3 



Northeast, days C 



East, days C 



Southeast, days 



South, days IG 



Southwest, days 5 



West, days 3 



Northwest, days 10 



Weather 



Mean relative humidity, percent 76.3 



Mean cloudiness, percent 61 



Number of clear days 10 



Number of fair days 15 



Number of cloudy days 6 



Number hours bright sunshine 259 



Percent of possible hours of bright 



sunshine 56.1 



Thunder and lightning 1st, 91 h 



11th, LSth, 22nd, 24th, 25th, 26th, 29(h 



30th. 



Normal 



Extremes 



30.27 



29.59 



29.£6 



0.68 



93.9 



46.4 

 70.8 



47.7 



4.10 



11 



3422 



4.6 



28.7 



SW 



68.4 

 50.9 

 10 

 14 



7 

 268 



58 



30.50, 1892 

 29.27, 1932 



0.97, 1892; 0.47, 1938 



104, 1911 



40, 1890, 1898 



74.7, 1921; 66.3, 1891 



14.51, 1897; 0.70, 1929 



20, 1915; 4, 1924 



5097, 1909; 1109, 1894 



44, 1936 



69, 1914; 31, 1924 

 22, 1923; 0, 1915 

 24, '09, '21; 5, '89, '23, '28, 

 '36 



18, 1889; 0, 1910 

 371, 1910; ISO, 1931 



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. 



