MONTHLY SUMMARY 



September, 1946 



Barometer, in inches 



(.Readings reduced to sea level) 



Maximum _. 30.48, 13tli 



Minimum _..._._ _______ _...__29.50. 30th 



Mean semi-daily __30.136 



Range ____ 0.98 



Air Temperature, in degrees F. 



Highest - 86, 19th, 20th 



Lowest .._ _ __ -IT, 14th 



Mean - _63.9 



Range _.._..•_____ : 49 



Highest mean daily 76, 10th 



Lowest mean daily ..._ ____ _52.5, 13th 



Mean maximum _____ _76.1 



Mean minimum __ ___ 51.7 



Greatest daily range — 37, 16th 



Least daily range 6, 24th 



Precipitation, in inches 



Precipitation _4.88 



Snow — 



Maximum precip, in 24 hrs 1.85, 30th 



Number of days with .01 or more 8 



Wind, in miles 



Total movement 2429 



Greatest daily movement 173, 30th 



Least daily movement ____ __23, 16th 



Mean hourly velocity _.- _ 3.4 



Maximum velocity _ 22, 30th 



Wind, direction 



Prevailing direction W 



North, days _-2 



Northeast, days - _ 3 



East, days _ __ _-3 



■ Southeast, days _5 



South, days 1 



Southwest, days __ ___ 5 



West, days -4 



Northwest, days 7 



Weather 



Mean relative humidity, percent .___ 78.4 



Mean cloudiness, percent .___ — 44 



Number of clear days _____ 18 



Number of fair days 6 



Number of cloudy days _ _ 6 



Number of hours bright sunshine .— _ —242 



Percent of possible hours of 



bright sunshine _.64.9 



Thunder and lightning _._ 30th 



First frost _ — 



Normal 



30.45 



29.57 



30.06 



.88 



87.7 

 33.2 

 61.7 



54.5 



4.24 

 10 



3271 



4.5 

 25.9 



WSW 



Extremes 



30.65, 1924 

 28.41. 1938 



1.99, 1938; .57, 1910 



97, 1895. 1929 

 24.5. 1914 



14.55, 1938; .52, 1914 



16, 19.33: X 1903 



4.686, 1896; 1,414, 1894 



80, 19.38 



73.6 



49.9 



10 



10 



10 



201 



54.9 



Sept. 21 



70, 1934; 27. 1908, 1914 

 19. 19,32; 2,-1907, 1928 



19, 1908; 3, 1889 



20. 1934; 3, 1941 

 255, 1916; 106, 19,34 



Oct. 13; Aug. 22 



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 19.38, except that humidity records are based on observations made 

 from 1929 to 1938. The third column gives extremes observed from 1889 to 1945. 



