MONTHLY SUMMARY 



October 1940 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.44, 5tli 



Minimum 29.67, 15th 



Mean semi-daily 30.081 



Range 0.77 



Air Temperature, in degrees F. 



Highest 76, 7th, 12th 



Lowest 19, 22nd, 28th 



Mean 46.7 



Range 57 



Highest mean daily 67.0, 7th 



Lowest mean daily 32.5, 28th 



Mean maximum 59.1 



Mean minimum 34.3 



Greatest daily range 39, 5th 



Least daily range 8, 30th 



Precipitation, in inches 



Precipitation 1.04 



Maximum precipitation in 24 hrs. 0.53, 30th 



31st 



Number of days with .01 or more 4 



Wind, in miles 



Total movement 3973 



Greatest daily movement 240. 15th 



Least daily movement 36, 25th, 30th 



Mean hourly velocity 5.3 



Maximum velocity 32, 18th 



Wind, direction 



Prevailing direction X\V 



North, days 12 



Northeast, days 



East, days 



Southeast, days . . .0 



South, days 7 



Southwest, days 3 



West, days 



Northwest, days 9 



Weather 



Mean relative humidity, percent 76. 



Mean cloudiness, percent 41 . 



Number of clear days 14 



Number of fair days 10 



Number of cloudy days 7 



Number hours bright sunshine 220 



Percent of possible hours of bright 



sunshine 64.5 



Thunder and lightning 



First frost Sept. 27 



30.53 



29.42 



30.06 



1.11 



79.4 

 23.4 

 50.5 

 56.0 



3.29 



9 

 4074 



29.5 



69.0 



48 

 10 

 10 

 11 

 175.0 



51.3 



Sept. 21 



30.68, 1929 

 29.00. 1926 



1.47, 1926; .76, 1899 



90.5, 1908 



17, 1936 



56.4, 1920; 43.2, 1890 



8.81, 1911; .01, 1924 



15,1913; 1,1897, 1924 

 5,467, 1910; 2,540, 1894 



42, 1937 



67, 1932; 18, 1924 



21, 1938; 1, 1911 



17, 1924; 3, 1938 



19, 1896; 3, 1924 



232, '23, '38; 91,1913 



Aug. 22,'94,'9o; Oct 15,'39 



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 1938, except that humidity records are based on observations made from 

 1929 to 1938. The third column gives extremes observed from 1889 to 1939. 



