MONTHLY SUMMARY 



December, 1945 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.43, 24th 



Minimum -— ....29.26, 31st 



Mean semi-daily 30.004 



Range — 1.17 



Air Temperature, in degrees F. 



Highest 49, Stii 



Lowest -3, 23rd 



Mean _ -.. 22.3 



Range . .. 52 



Highest mean daily 40, 8th 



Lowest mean daily 9.5, 23rd 



Mean maximum 30.4 



Mean minimum 14.2 



Greatest daily range 30, 25th 



Least daily range 7, 7th 



Precipitation, in inches 



Precipitation 3.91 



Snow 18.8 



Maximum precipitation in 24 hrs. 



---. --_ ._ .-0.91, 25th, 26th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 3926 



Greatest daily movement 354, 11th 



Least daily movement 0, I5th 



Mean hourly velocity — 5.3 



Maximum velocity 32, 12th 



Wind, direction 



Prevaihng direction WNW 



North, days 



Northeast, days .— 



East, days 



Southeast, days 2 



South, days — _. 1 



Southwest, days 4 



West, days 12 



Northwest, days 12 



Weather 



Mean relative humidity, percent IZ.'i 



Mean cloudiness, percent 56 



Number of clear days 11 



Number of fair days 7 



Number of cloudy days 13 



Number hours bright sunshine 122 



Percent of possible hours of bright 



sunshine 43.1 



Thunder and lightning — 



Normal 



Extremes 



30.66 



29.27 



30.06 



1.38 



54.3 

 -1.9 



27.5 

 56.2 



3.39 

 8.50 



10 



4710 



6.3 

 31.4 



WNW 



69.4 



54.9 



8 



9 



14 



128 



45.2 



30.96, 1889 

 28.85, 1915 



1.78, 1895; 1.01, 1892 



65.5, 1908 



-22.5, 1917 



36.9, 1891; 17.1, 1917 



l.n, 1901; .58, 1943 

 26.50, "02; t, 1891, 1943 



17, 1902; 4, 1892, 1943 



6,694, 1925; 3,239, 1918 



48, 1938, 1943, 1944 



71, 1929; 39. 1919 



15, 1890; 2. 1922, 1933 



16,'09;4, '89'30, '31.'36,'38 



23. 'Z7>; 7, '09, '23 



172, 1896; 63, 1933 



Note — The tirst 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 1944 



