Monthly Summary 



September, 1984 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.53, 1st 



Minimum 29.75, 9th 



Mean semi-daily 30.126 



Range 0.78 



Air Temperature 



Highest 83, 26th 



Lowest 42, 1st 



Mean 64.6 



Monthly range 41 



Highest mean daily 73, 25th 



Lowest mean daily 57.5, 29th 



Mean maximum 73.2 



Mean minimum 55.9 



Greatest daily range 32, 1st 



Least daily range 6, 15th 



Precipitation 



Precipitation. In inches 9.54 



Snow, in inches I 



Maximum precipitation in 24 hrs. 4.51, 



16th, 17th 

 Number of days on which .01 or more 



inches of rain fell 14 



Wintl (miles) 



Total movement 2,846 



Greatest daily movement 211, 18th 



Least daily movement 44, 6th, 25th 



Mean hourly velocity 4.0 



Maximum velocity for 5 min., 39, 27th 

 ((•(irrected to coiifi)rm to K cup aneiuometev) 



Wind (direction) 



Prevailing direction e 



North, days .... 5 



Northeast, days 3 



East, days 3 



Southeast, days 10 



South, days 2 



Southwest, days 2 



West, days 2 



Northwest, days 3 



Weather 



Mean relative humidity, per cent. . 77.7 



Mean cloudiness, per cent 70.0 



Number of clear days 5 



Number of fair days 5 



Number of cloudy days 20 



Number of hours bright sunshine 106.0 

 Percent of possible hours of bright 



sunshine 28 



Thunder and Lightning 27th 



First frosts 



30.45 



29.59 



30.068 



.86 



87.4 

 32.8 

 61.6 

 54.6 



3.79 



3,252 



4.5 



22 



80.0 

 48.7 

 9 

 11 

 10 

 202.5 



54.4 

 19th 



30.65, 1924 

 29.32, 1900 



1.20, 1904; 0.57, 1910 



97.0, 1895, 1929 

 24.5, 1914 



8.74, 1907; 0.52, 1914 



15, 1918; 3, 1903 

 4,686, 1896; 1,414, 1894 



39, 1915 



89, 1927; 68, 1932 



65, 1889; 27, 1908, 1914 



19, 1932; 2, 1907, 1928 



19, 1908; 3, 1889 



19, '89 '07; 4, '08 '16 



255, 1916; 110, 1907 



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 

 1928. The third column gives extremes observed from 1889 to 19.S3. 



