MONTHLY SUMMARY 



October 1939 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.41, 18th 



Minimum 29.28, 3lst 



Mean semi-daily 30 018 



Range 1.13 



Air Temperature, in degrees F. 



Highest 89, 10th 



Lowest 23, 30th 



Mean 50.2 



Range 66 



Highest mean daily 72, 10th 



Lowest mean daily 34, 30th 



Mean maximum 61.1 



Mean minimum 39.3 



Greatest daily range 41, 21st 



Least daily range 2, 31st 



Precipitation, in inches 



Precipitation 4.55 



Snow 



Max. precipitation in 24 hrs 1 75, 31st 



Number of days with 01 or more 13 



Wind, in miles 



Total movement 4792 



Greatest daily movement 309, 24th 



Least daily movement 44. 5th 



Mean hourly velocity 6 4 



Maximum velocity 39, 28th 



Wind, direction 



Prevailing direction WNW 



North, days 5 



Northeast, days 



East, days 



Southeast, days 3 



South, days 5 



Southwest, days 3 



West, days 3 



Northwest, days 12 



Weather 



Mean relative humidity, percent 72.0 



Mean cloudiness, percent 47.0 



Number of clear days 9 



Number of fair days 10 



Number of cloudy days 12 



Number hours bright sunshine 159 



Percent of possible hours of bright 



sunshine 46.6 



Thunder and lightning 6th, 8th 



First Frost Oct. 15 



69 



48 

 10 

 10 

 11 

 175.0 



51.3 



Sept. 21 



8.81, 1911; .01, 1924 



67, 1932; 18, 1924 



21, 1938; 1, 1911 



17. 1924; 3, 1938 



19, 1896; 3, 1924 



232, '23, '38; 91, 1913 



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



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 1938. 



