Monthly Summary 



December, 1985 



Normal 



Extremes 



Barometer 



( Readings reduced to sea level) 



Maximum 30.68, 7 th 



Minimum 29.44, 20th 



Mean semi-daily 30.002 



Range 1.24 



Air Xemperaliire 



Highest 44, 8th 



Lowest -1, 29th 



Mean 24.9 



Monthly range 45 



Highest mean daily 39 8th, 9th 



Lowest mean daily 6.5, 29th 



Mean maximum 31.2 



Mean minimum 18.5 



Greatest daily range 25, 7th, 31st 



Least daily range 4, 15th 



Precipitation 



Precipitation. In inches 1.05 



Snow, in inches 2.00 



Maximum precipitation in 24 hrs. 



0.49, 15th, 16th 

 Number of days on which .01 or more 



inches of rain fell 8 



Wind (miles) 



Total movement 4815 



Greatest daily movement 336, 27th 



Least daily movement 41, 2nd 



Mean hourly velocity 6.5 



Maximum velocity for 5 min., 32, 4th 



Wind (direction) 



Prevailing direction nw 



North, days 6 



Northeast, days 1 



East, days 



Southeast, days 3 



South, days 2 



Southwest, days 



West, days 1 



Northwest, days 18 



Weather 



Mean relative humidity, per cent. . 64.7 



Mean cloudiness, per cent 53.4 



Number of clear days 14 



Number of fair days 6 



Number of cloudy days 11 



Number of hours bright sunshine . . 162 

 Percent of possible hours of bright 



sunshine 57.1 



Thunder and Lightning 



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 



70.0 



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 



45, 1934 



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 gives the averages based on observations made from 18!<9 to 

 I3i«. except that humidity records are based on observations from 1929 to 1984 The 

 third column gives extremes observed from 1889 to 1984. 



