Monthly Summary 



December, 1934 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.50, 23rd 



Minimum 29.06, 19th, 20th 



Mean semi-daily 30.051 



Range 1.44 



Air Temperature 



Highest 7 64, 1st 



Lowest 2, 9th 



Mean 26.4 



Monthly range 62 



Highest mean daily 62, 1st 



Lowest mean daily 10, 11th 



Mean maximum 33.1 



Mean minimum 19.6 



Greatest daily range 34, 19th 



Least daily range 3, 2nd 



Precii>i(a<ioii 



Precipitation. In inches 2.99 



Snow, in inches 3.50 



Maximum precipitation in 24 hrs. 0.88, 



19 th 

 Number of days on which .01 or more 



inches of rain fell 9 



Wind (miles) 



Total movement 5,295 



Greatest daily movement 521, 27th 



Least daily movement 43, 22nd 



Mean hourly velocity 7.1 



Maximum velocity for 5 min., 45, 27th 

 (corrected U) conform to o cup anemometer) 



Wind (direction) 



Prevailing direction nw 



North, days 2 



Northeast, days 



East, days 1 



Southeast, days 5 



South, days 



Southwest, days 3 



West, days 4 



Northwest, days 16 



Weather 



Mean relative humidity, per cent. . 72.7 



Mean cloudiness, per cent 56.0 



Number of clear days 11 



Number of fair days 6 



Number of cloudy days 14 



Number of hours bright sunshine 137.9 

 Percent of possible hours of bright 



sunshine 48.7 



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, 1933 

 16, 1909;4, 1889, 1930, 1931 

 19,1911,1922:7,1909,1923 



172, 1896; 63.1, 1933 



Note— The first column in the above summary gives observations made during the 

 month. The second column eri ves the averages based on observations made from 18f9 to 

 1928. The third column gives extremes observed from \H»'.} to lys.S 



