MONTHLY SUMMARY 



Or-tober 1947 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.52, 25th 



Minimum 29.71, 19th 



Mean semi-dailv 30.142 



Range " 0.81 



Air Temperature, in degrees F. 



Highen 86. 16th 



Lowest 23, 2.'^th 



Mean 57.4 



Range 63 



Highest mean daily 70.5, 19th 



Lowest mean daily 41.0, 31st 



Mean maximum 71.6 



Mean minimum 43.2 



Greatest daily rangt-. . .' 41, 25th 



Least dailv range 8, 30th 



Precipitation, in inches 



.01 



Precipitation 



Snow — 



Maximum precip. in 24 hrs 1.00, 31st 



Number of days with .01 or more 4 



Wind, in miles 



Total movement 3240 



Greatest daily movement 241, 31st 



Least daily movement 24. 3rd 



Mean hourly velocity 4.4 



Maximum velocity 32, 2nd 



Wind, direction 



PrevaiHng irection SSE 



North, days 4 



Northeast, days 4 



East, days 



Southeast, days 9 



South, days 7 



Southwest, days 3 



West, days 2 



Northwest, days 2 



Weather 



Mean relative humidity, percent 70.1 



Mean cloudiness, percent 60 



Number of clear days 18 



Number of fair days 6 



Number of cloudy days 7 



Number of hours bright sunshine 227 



Percent of possible hours of 



bright sunshine 66.5 



Thunder and lightning — 



First Frost 



30.53 



29.42 



30.06 



1.11 



79.4 

 23.4 

 50.5 

 56.0 



^ 19 



4074 



5.4 

 29.5 



W 



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 



Aug. 22,'94.'95; 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 1946. 



