MONTHLY SUMMARY 



SEPTEMBER 1952 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.162 



Minimum 29.990 



Mean semi-daily 30.090 



Range 0.172 



Air Temperalure, in Degrees F. 



Highest 89, 12th, 13th 



Lowest 37 2Sth 



Mean 63.2 



Range 52.0 



Highest mean daily 75.5, 2nd, 13th 



Lowest mean daily 54.0, 24th 



Mean maximum 75.0 



Mean minimum 51.5 



Greatest daily range 38, 29th 



Least daily range 5, 3rd 



Degree-days of heating load for month 11 1.0 

 Degree-days cumulative for season. . . 111.0 



Precipitation, in inches 



Precipitation 4.05 



Snow — 



Maximum precip. in 24 hrs 2.13, 19th 



Number of days with .01 or more 6 



Wind, in miles 



Total movement 2190 



Greatest daily movement 192, 7th 



Least daily movement 33, 12th, 24th 



Mean hourly velocity 3.15 



Maximum velocity 20, 3rd, 26th 



Wind direction 



Prevailing direction ESW 



North, days 3 



Northeast, days 1 



East, days 3 



Southeast, days 5 



South, days 



Southwest, days 4 



West, days 

 Northwest, davs. 



WeaHier 



Mean relative humidity, percent 82.2 73.6 



Mean cloudiness, percent 44.5 49.9 



Number of clear days 1 10 



Number of fair days 8 10 



Number of cloudy days 21 10 



Number of hours bright sunshine 85.3 201 



Percent of possible hours of 



bright sunshine 22.8 | 54.*^ 



Thunder and lightning 19th, 26th l 



First Frost Sept. 21 



Normal 



30.45 



29.57 

 30.00 



.88 



87.7 

 33.2 

 61.7 



54.5 



4.24 

 10 



3271 



4.5 

 25.9 



wsw 



Extremes 



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-^5 



Note — The first column in the above summary lists observation* made during the month. 

 The second column lists the averages based on observations made from 1889 to 1938, 

 except that humidity lecords are based on observations made from 192'^ to 1938. The 

 third column lists extremes observed from 1889 to 1951. 



