MONTHLY SUMMARY 



DECEMBER 1953 



I>aronieter in inches 



(Readings reduced to sea level) 



Maximum 30.301, 24l1i 



Minimum 29.221, lith 



Mean semi-daily 29.973 



Range 1.080 



Air remperalure, in degrees F. 



Highest 59, 7th. 8th 



LoWest 8, 18th 



Mean 34.9 



Range 51 



Highest mean daily 48, 10th 



Lowest mean daily 16.5, 17th 



Mean maximum 43.8 



Mean minimum 26.0 



Greatest daily range 32,5th 



Least daih range 6, I'^t 



Degree-days of heating load for month 932.5 

 Degree-days cumulative for season. . 2080.5 



Precipitation, in inches 



Precipitation 4.53 



Snow 1.00 



Maximum precip. in 24 hrs 1.08 



Number of days with .01 or more 12 



Wind, in miles 



Total movement 3825 



Greatest daily movement. .' 2^5, 23rd 



Least daily movement 10. 30th 



Mean hourly velocity 5.1 



Maximum velocity 39, 15th 



Wind, direction 



Prevailing direction WNW 



North, days 2 



Northeast, days — 



East, days — 



Southeast, days 7 



South, days 3 



Southwest, days — 



West, days 14 



Northwest, days 5 



Weather 



Mean relative humidity, percent 74.8 



Mean cloudiness, percent 56.9 



Number of clear days 3 



Number of fair days 16 



Number of cloudy days 12 



Number of hours bright sunshine 94.^) 



Percent of possible hours of 



bright sunshine 33.5 



Thunder and lightning — 



l'"ii St Snow 



Normal 



1162.5 

 2494.0 



3.39 

 8.50 



10 



4710 



6.i. 

 31.4^ 



WNW 



69.4 

 54.9 



8 



9 



14 



128 



45.2 

 Nov. 6 



Extremes 



30. '.6 



29.27 



30.06 



1.38 



54.3 



— 1.9 



27.5 



56.2 



31.104, 1949 

 28.85, 1915 



1.78, 1895; 1.01, 1892 



65.5, 1908 



—22.5, 1917 



36.9, 1891; 17.1, 1917 



7.77, 1901; .58, 1943 

 26.50, 1092; T, 1891, 1943 



17, 1902; 4, 1892, 1943 



6694. 1925; 3239, 1918 



66, 1949 



71. 1929; 39, 1919 



15, 1890; 0, 1948 



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



25, 1948; 7, '09, '23 



172, 1896; 27. 1948 



Note — The first column in the above summarj' lists observations made during the month. 

 The second column lists 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 lists extremes observed from 1889 to 1952. 



