Monthly Summary 



October, 1931 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.43, 13th 



Minimum 29.28,17th 



Mean semi-daily 30.015 



Range 1.15 



Air Xempersiture 



Highest 83,5th 



Lowest 29, 10th, 13th 



Mean 53.6 



Monthly range 54 



Highest mean daily 69.0, 5th 



Lowest mean daily 42.5, 18th 



Mean maximum 66.3 



Mean minimum 41.0 



Greatest daily range 39, 20th 



Least daily range 11, 26th, 29th 



Precipitation 



Precipitation. In inches 3.06 



Snow, in inches 



Maximum precipitation in 24 hrs. .87, 



29th 

 Number of days on which .01 or 



more inches of rain fell 10 



Wind (miles) 



Total movement 3,761 



Greatest daily movement .... 385, 26th 



Least daily movement 39, 10th 



Mean hourly velocity 5.5 



Maximum velocity for 5 min 32, 26th 



{(•orrecit'fi to oonfonn to H cuij anemometer) 

 Wind (direction) 



Prevailing direction w 



North, days 



Northeast, days 



East, days 



Southeast, days 2 



South, days 7 



Southwest, days 4 



West, days 7 



Northwest, days 11 



Weather 



Mean relative humidity, per cent . . 66.4 



Mean cloudiness, per cent 49 



Number of clear days 15 



Number of fair days 8 



Number of cloudy days 8 



Number of hours bright sunshine 203.1 

 Percent of possible hours of bright 



sunshine 60 



Thunder and lightning 25th 



Frost 10th, 11th, 13th, 14th, 19th, 20th 



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 finst column in the above summary gives observations made rturinc the 

 month. The second column erives averages based on observations made from IHHD to 

 ly^S. The third column gives extremes observed from 188!) to 1930. 



