Monthly Summary 



October, 1930 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.40, 7th 



Minimum 29.40, 25th 



Mean semi-daily 30.060 



Range 1.00 



Air Temperature 



Highest 83,13th 



Lowest 21, 23rd 



Mean 48.9 



Monthly range 62 



Highest mean daily .... 62.5, 11th, 12th 



Lowest mean daily 35, 21st 



Mean maximum 61.0 



Mean minimum 36.3 



Greatest daily range 42, 13th 



Least daily range 8, 15th 



Precipitation 



Precipitation. In inches 2.24 



Snow, in inches Trace 



Maximum precipitation in 24 hrs. 



.70, 25th 

 Number of days on which .01 or 



more inches of rain fell 9 



Wind (miles) 



Total movement 3,729 



Greatest daily movement 392, 25th 



Least daily movement 34, 12th 



Mean hourly velocity 5 



Maximum velocity for 5 min .... 32, 25th 

 ^c()I•rected to cnntonn to 3 cup anemometer) 



Winil (direction) 



Prevailing direction nw 



North, days 2 



Northeast, days 



East, days 1 



Southeast, days 4 



South, days 2 



Southwest, days 1 



West, days 5 



Northwest, days 16 



Weather 



Mean relative humidity, per cent. . 73.0 



Mean cloudiness, per cent 45 



Number of clear days 11 



Number of fair days 10 



Number of cloudy days 10 



Number of hours bright sunshine 185.4 

 Percent of possible hours of bright 



sunshine 54 



Thunder and lightning 



Frosts 1, 2, 4, 7, 19, 20, 21, 22, 23, 27 



30.53 



29.42 



30.059 



1.11 



79.7 

 23.4 

 50.4 

 56.3 



3.35 



4,023 



5.4 

 27 



76.9 

 47.6 

 8 



11 



12 

 171.0 



50 



30.68, 1929 

 29.00, 1926 



1.47, 1926; 0.76, 1899 



90.5, 1908 

 18.0, 1904 



8.81, 1911; 0.01, 1924 



15, 1913; 1, 1897, 1924 

 5,467, 1910; 2,540, 1894 



35, 1906, 1916, 1925 



86.7, 1920 ; 64, 1929 



64, 1890, 1900; 18, 1924 



14, 1897, 1916; 1, 1911 



17, '24; 5, '94, '96, '98, '03, '17 



19, 1896 ; 3, 1924 



232, 1923 ; 91, 1913 



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

 month. The second and third columns give the averages and e.Ktremes observed fr(jm 18S9 

 to 1929. 



