Monthly Summary 



December, 1933 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.87, 29th 



Minimum 29.49, 21st 



Mean semi-daily 30.097 



Range 1.38 



Air Xeinperaiure 



Highest 55, 8th 



Lowest -20, 30th 



Mean 22.3 



Monthly range 75 



Highest mean daily 40.5, 8th 



Lowest mean daily -11.5, 30th 



Mean maximum 30.5 



Mean minimum 14.0 



Greatest daily range 30, 28th 



Least daily range 6, 22d, 24th 



Precipitjilion 



Precipitation. In inches 2.81 



Snow, in inches 16.00 



Maximum precipitation in 24 hrs. .82, 



20th, 21st 

 Number of days on which .01 or more 



inches of rain fell 10 



Wind (miles) 



Total movement 5,150 



Greatest daily movement 496, 1st 



Least daily movement 37, 13th 



Mean hourly velocity 6.9 



Maximum velocity for 5 min. . . 40, 27th 

 (corrected to conform to 3 cnj) anemometer) 



Wind (direction) 



Prevailing direction wsw 



North, days 1 



Northeast, days 1 



East, days 



Southeast, days .....' 6 



South, days 7 



Southwest, days 1 



West, days 5 



Northwest, days 10 



Weather 



Mean relative humidity, per cent . . 67.4 



Mean cloudiness, per cent 66.0 



Number of clear days 2 



Number of fair days 6 



Number of cloudy days 23 



Number of hours bright sunshine 63.1 

 Percent of possible hours of bright 



sunshine 22.3 



Thunder and Lightning, 



Frosts, 



30.65 



29.25 



30.056 



1.40 



54.5 

 -2.3 

 27.3 

 56.8 



3.47 

 8.99 



9 



4,726 



6.4 

 29 



77.2 

 53.4 

 8 

 10 

 13 

 130.7 



46.0 



30.96, 1889 

 28.85, 1915 



1.78, 1895; 1.01, 1892 



65.5, 1908 

 -22.5, 1917 



7.77, 1901; 0.87, 1896 

 26.50, '02; t, 1891 



17, 1902; 4, 1892 

 6,694, 1925; 3,239, 1918 



41, 1928 



87.1, 1919; 63, 1931 

 71, 1929; 39, 1919 

 15, 1890; 2, 1922 

 16, 1909; 4, 1889, 1930, 1931 

 19, 1911, 1922; 7, 1909, 1923 

 172, 1896; 86, 1922 



NorK— Tlie first column in the above summary ffives observations made durinn the 

 month. The second column erives the averattes based on observations made from 18-'.i to 

 1928. The third column ffives extremes observed from 1«H9 to 1932 



