MONTHLY SUMMARY 



August 1941 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.36, 29th 



Minimum 29.49, 12th 



Mean semi-daily 29.920 



Range 0.87 



Air Temperature, in degrees F. 



Highest 91, 8th 



Lowest 41, 18th 



Mean 67.1 



Range 50 



Highest mean daily 78, 26th 



Lowest mean daily 56.5, 13th 



Mean maximum 80.0 



Mean minimum 51.2 



Greatest daily range 39, 18th 



Least daily range 10, 19th 



Precipitation, in inches 



Precipitation 1.79 



Maximum precipitation in 24 hrs. 0.47, lOtl 



Number of days with .01 or more 9 



Wind, in miles 



Total movement 4030 



Greatest daily movement 267, 1 2th 



Least daily movement 54, 9th 



Mean hourly velocity 5.4 



Maximum velocity 40, 12th 



Wind, direction 



Prevailing direction W 



North, days 3 



Northeast, days 



East, days 



Southeast, days 1 



South, days 7 



Southwest, days 4 



West, days 4 



Northwest, days .12 



Weather 



Mean relative humidity, percent 66.3 



Mean cloudiness, percent 47.6 



Number of clear days 23 



Number of fair days 4 



Number of cloudy days 4 



Number liours bright sunshine 332 



Percent of possible hours of bright 



sunshine 89 



Thunder and lightning. . . 10th, 17th, 23rd, 



31st 

 First f ro.st 



30.32 



29.61 



30.00 



0.71 



91.6 

 43.4 



68.6 

 48.1 



sw 



70.2 



49.7 



9 



13 



9 



237 



55.2 



Sept. 21 



30.50, 1934 

 28.87, 1930 



100, 1918 



37, 1894, 1908 



34, 1940 



8.40, 1928; .31, 1894 

 10, 1892, 1933; 4,1899 

 4,271, 1910; 1,920, 1894 



35, 1915 



67, 1901; 27, 1923 



21, 1939; 0, 1915, 1929 



25, 1912; 3, 1939 



18, 1901, '28; 2, 1910, '23 



317, 1921; 152, 1915, 1929 



Aug. 22, '94, '95; Oct. 13, '09 



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. 



