Monthly summary 



September. 1930 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.33, 1st 



Minimum 29.64, 27th 



Mean semi-daily 29.981 



Range 69 



Air Temperature 



Highest 88,16th 



Lowest 35,29th 



Mean 64 



Monthly range 53 



Highest mean daily 78, 16th 



Lowest mean daily 49, 29th 



Mean maximum 76.0 



Mean minimum 52.0 



Greatest daily range 35, 5th, 20th 



Least daily range 7, 13th 



Precipitation 



Precipitation. In inches 2.08 



Snow, in inches 



Maximum precipitation in 24 hrs. 



.50, 21st 

 Number of days on which .01 or 



more inches of rain fell 10 



Wind (miles) 



Total movement 2,922 



Greatest daily movement 170, 15th 



Least daily movement 48, 11th, 26th 



Mean hourly velocity 4 



Maximum velocity for 5 min 25, 3rd 



(durected tii couforin to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction sse 



North, days 1 



Northeast, days 1 



East, days 



Southeast, days 14 



South, days 3 



Southwest, days 1 



West, days 3 



Northwest, days 7 



Weather 



Mean relative humidity, per cent. . 74.8 



Mean cloudiness, per cent 51 



Number of clear days 15 



Number of fair days ... 10 



Number of cloudy days 5 



Number of hours bright sunshine 240.5 

 Percent of possible hours of bright 



sunshine 65 



First frost 



Thunder and lightning 6th, 21st 



30.45 



29.59 



30.068 



0.86 



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 

 19 



30.65, 1924 

 29.32, 1900 



1.20, 1924; 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; 70.7, 1892 



65, 1889 ; 27, 1908, 1914 



18, 1891; 2, 1907, 1928 



19, '1908; 3, 1889 



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



255, 1916; 110, 1907 



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



.Mote— The tirst culunin in the above summary gives observations made during- the 

 niMutli. I'he seconil luid third culunin^ -ivt- tin- averages and extremes observed from 1S89 

 to 1929. 



