Monthly Summary 



September. 1986 



iC;irome<er 



(Readin.i;s reduced to sea level) 



Maximum . 30.49, 14th 



Minimum 29.59, 24th 



Mean semi-daily 30.100 



Range 0.90 



Air Xt* III peril lure 



Highest 88, 8th 



Lowest 32, 26th 



Mean 62.3 



Monthly range 56 



Highest mean daily 74, 8th 



Lowest mean daily 47.5, 30th 



Mean maximum 72.7 



Mean minimum 51.8 



Greatest daily range 32, 6th 



Least daily range 6, 15th 



Prpcipifation 



Precipitation. In inches 3.80 



Snow, in inches 



Maximum precipitation in 24 hrs. 



1.15, 8th 

 Number of days on which .01 or more 



inches of rain fell 11 



Wind (miles') 



Total movement 3879 



Greatest daily movement 297, 25th 



Least daily movement 45, 2nd 



Mean hourly velocity 5.4 



Maximum velocity for 5 min., 28, 24th 

 Wlii.I (direction) 



Prevailing direction s 



North, days 2 



Northeast, days 1 



East, days 1 



Southeast, days 9 



South, days 6 



Southwest, days 1 



West, days 4 



Northwest, days 6 



Weather 



Mean relative humidity, per cent. . 76.2 



Mean cloudiness, per cent 57 



Number of clear days 9 



Number of fair days ... 11 



Number of cloudy days 10 



Number of hours bright sunshine . 185 

 Percent of possible hours of bright 



sunshine 49.6 



Thunder and Lightning 2nd, 8th, 12th 

 Frosts 26th 



First Frost 26th 



Normal 



Extremes 



30.45 



29.59 



30.068 



.86 



87.4 

 32.8 

 61.6 

 54.6 



3.79 



9 



3,252 



4.5 

 22 



30.65, 1924 

 29.82, 1900 



1.20, 1904; 0.57, 1910 



97.0, 1895, 1929 

 24.5, 1914 



12.34, 1933; 0..52, 1914 



15, 1918; 3, 1903 

 4,686, 1896; 1,414, 1894 



39, 1915, 1934 



73.2 



48.7 J70.0, 1934; 27, 1908,1914 

 19, 1932; 2, 1907, 1928 



11 



10 



202.5 



54.4 

 19th 



19, 1908; 3, 1889 

 20, 1934, 4, '08, '16 

 255, 1916; 106, 1934 



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



NoTK — The first column in the above summary gives observations made duriii": the 

 month. The second column gives the averages based on observations made from 1889 

 to 1928. except that humidity records are based on observations made from 1929 to 19^:'). 

 The third column gives extremes observed from 1889 to 198.5. 



