MONTHLY SUMMARY 



SEPTEMBER 1953 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.567, 24th 



Minimum 29.623, 13th 



Mean semi-daily 30.006 



Range 0.944 



Air Temperature, in degrees F. 



Highest 99, 2nd 



Lowest 30, 24th 



Mean 63.5 



Range 49 



Highest mean daily 83.5, 2nd 



Lowest mean daily 47.5, 23rd 



Mean maximum 76.4 



Mean minimum 50.6 



Greatest daily range 38, 1, 10, 11, 24 



Least daily range 13, 6th 



Degree-days of heating load for month. 141 

 Degree-days cumulative for season 141 



Precipitation, in inches 



Precipitation 1.42 



Snow — 



Maximum precip. in 24 hrs 1.42 



Number of days with .01 or more 4 



Wind, in miles 



Total movement 3 100 



Greatest daily movement 216, 14th 



Least daily movement 23, 15th 



Mean hourly velocity 4.3 



Maximum velocity 22, 30th 



Wind, direction 



Prevailing direction WNW 



North, days — 



Northeast, days — 



East, days — 



Southeast, days 10 



South, days 2 



Southwest, days 2 



West, days 7 



Northwest, days 9 



Weather 



Mean relative humidity, percent 69.3 



Mean cloudiness, percent 38.2 



Number of clear days 15 



Number of fair days 15 



Number of cloudy days — 



Number of hours bright sunshine. . . .239.6 

 Percent of possible hours of 



bright sunshine 63.8 



Thunder and lightning — 



First Frost 24th 



Normal 



30.45 

 29.57 

 30.00 



87.7 

 33.2 

 61.7 

 54.5 



4.24 

 10 



3271 



4.5 

 25.9 



WSW 



Extremes 



73.6 

 49.9 

 10 

 10 

 10 

 201 



54.9 

 Sept. 21 



30.65, 1924 

 28.41, 1938 



1.99, 1938; 57, 1910 



97,1895, 1929 

 24.5, 1914 



14.55, 1938; 0.52, 1914 

 16, 1933; 3, 1903 



4,680, 1896; 1414, 1894 

 80, 1938 



70,1934; 23, 1947 



19, 1932; 2, 1907, 1928 



19, 1908; 3, 1889 



20, 1934; 3, 1941, 1948 

 255, 1916; 106, 1934 



Oct. 13, 1909; Aug. 22, 1894-95 



Note — The first column in the above summary 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. 



