MONTHLY SUMMARY 



December, 1943 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.55, 25th 



Minimum 29.36, lOtli 



Mean semi-daily 30.05 1 



Range 1.19 



*Air Tenjperature, in degrees F. 



Highest 50, 9th, 27th 



Lowest --6, 24th 



Mean 24.9 



Range - 56 



Highest mean daily 41.5, 9th 



Lowest mean daily 7.5, 23rd 



Mean maximum 35.0 



Mean minimum .._. 14.8 



Greatest daily range - 32, 25th 



Least daily range 7, 11th 



Precipitation, in inches 



Precipitation 58 



Snow T 



Maximum precipitation in 24 hrs. 



32, 26th, 27th 



Number of days with .01 or more 4 



Wind, in miles 



Total movement 441 1 



Greatest daily movement ___. ..—513, 11th 



Least daily movement 9, 31st 



Mean hourly velocity 5.9 



Maximum velocity 48, 20th 



Wind, direction 



Prevailing direction W 



North, days 



Northeast, days 



East, days ...O 



Southeast, days — 5 



South, days 4 



Southwest, days ....0 



West, days 9 



Northwest, days 13 



Weather 



Mean relative humidity, percent 64.9 



Mean cloudiness, percent .46 



Number of clear days 11 



Number of fair days 10 



Number of cloudy days 10 



Number hours bright sunshine 145 



Percent of possible hours of bright 



sunshine 51.2 



Thunder and lightning — 



Normal 



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 



Extremes 



30.96, 1889 

 28.85, 1915 



1.78, 1895; 1.01, 1892 



65.5, 1908 



-22.5, 1917 



36.9, 1891; 17.1, 1917 



7.77, 1901; .87, 1896 

 26.50, '02; t, 1891 



17, 1902; 4, 1892 



6,694, 1925; 3,239, 1918 



48, 1938 



71, 1929; 39, 1919 



15, 1890; 2, 1922, 1933 



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



23, '33; 7, '09, '23 



172, 1896; 63, 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 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 1942. 



