MONTHLY SUMMARY 



September, 1943 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.55, 29th 



Minimum --- 29.78, 7th 



Mean semi-daily - 30.123 



Range .0.77 



Air Temperature, in degrees F. 



Highest 91, 7th 



Lowest - - --34, 19th, 26th 



Mean - 61.1 



Range 57 



Highest mean daily 80, 7th 



Lowest mean daily 48, 26th 



Mean maximum 73.0 



Mean minimum 49.3 



Greatest daily range 43, 28th 



Least daily range 9, 3rd 



Precipitation, in inches 



Precipitation 2.40 



Snow — 



Maximum precipitation in 24 hrs..., 1.26, 15th 

 Number of days with .01 or more 6 



Wind, in miles 



Total movement 2867 



Greatest daily movement 177, 30th 



Least daily movement 40, 1st 



Mean hourly velocity 4.0 



Maximum velocity 22, 9th, 16th 



Wind, direction 



Prevailing direction WNW 



North, days 



Northeast, days 1 



East, days - - 1 



Southeast, days — 6 



South, days 3 



Southwest, days 2 



West, days 2 



Northwest, days 15 



Weather 



Mean relative humidity, percent 75.2 



Mean cloudiness, percent 61 



Number of clear days 12 



Number of fair days 11 



Number of cloudy days 7 



Number hours bright sunshine 228 



Percent of possible hours of bright 



sunshine 61.1 



Thunder and lightning ....7th, 9th 



First frost — 



Extremes 



30.45 

 29.57 

 30.06 



87.7 



61.7 



54.5 



4.26 



10 



3271 



4.5 

 25.9 



WSW 



73.6 



49.9 



10 



10 



10 



201 



54.9 



Sept. 21 



30.65, 1924 

 28.41, 1938 



1.99, 1938; .57, 1910 



97, 1895, 1929 

 24.5, 1914 



14.55, 1938; .52, 1914 



16, 1933; 3, 1903 



4.686, 1896; 1,414, 1894 



80, 1938 



70, 1934; H, 1908, 1914 

 19, 1932; 2, 1907, 1928 



19, 1908; 3, 1889 



20, 1934; 3, 1941 

 255, 1916; 106, 1934 



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



Note — The first column in the above summary gives observations made during 

 the month. The second colunm 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 1942. 



