MONTHLY SUMMARY 



July 1941 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.24, 14tli 



Minimum 29.62, 28th 



Mean semi-daily 29.936 



Range 0.62 



Air Temperature, in degrees F. 



Highest 93, 2nd 



Lowest 49, 21st 



Mean 71.2 



Range 44 



Highest mean daily 81, 2nd 



Lowest mean daily 65, 4th 



Mean maximum 82.0 



Mean minimum 60.4 



Greatest daily range 33, 21st 



Least daily range 8, 4th 



Precipitation, in inches 



Precipitation 4.04 



Maximum precipitation in 24 hrs. 1.90, 28th 



Number of days with .01 or more 10 



Wind, in miles 



Total movement 3447 



Greatest daily movement 224, 19th 



Least daily movement 45, 23rd 



Mean hourly velocity 4.6 



Maximum velocity 25, 25th 



Wind, direction 



Prevailing direction 8 



North, days 3 



Northeast, days 



East, days 2 



Southeast, days 4 



South, days 13 



Southwest, days 2 



West, days 2 



Northwest, days 5 



Weather 



Mean relative humidity, percent 72.9 



Mean cloudiness, percent 57 



Number of clear days 16 



Number of fair days 10 



Number of cloudy days 5 



Number hours bright sunshine 300 



Percent of possible hours of bright 



sunshine 64 . 9 



Thunder and lightning . Ist, 2nd, 8th, 12th 

 13th, 25th, 28tli 



Normal 



Extremes 



30.27 



29.59 



29.96 



0.68 



93.9 

 46.4 

 70.8 



47.7 



sw 



68.4 

 50.9 

 10 

 14 



268 



58 



30.50, 1892 

 29.27, 1932 



0.97, 1S92;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, 1911; 31, 1924 

 22, 1923; 0, 1915 

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

 '36 



IS, 1889; 0, 1910 

 371, 1910; 180, 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 1940. 



