MONTHLY SUMMARY 



September, 1945 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum ....30.61, 30th 



Minimum 29.69, 1 1th 



Mean semi-daily 30.156 



Range 0.92 



Air Temperature, in degrees F. 



Highest 91, 7th, 8th 



Lowest ...36, 30th 



Mean 64.6 



Range 55 



Highest mean daily 75.5, 1st, 7th 



Lowest mean daily 46.5, 30th 



Mean maximum .- 74.5 



Mean minimum 54.6 



Greatest daily range _ 33, 8tli 



Least daily range - 8, 11th 



Precipitation, in inches 



Precipitation 3.57 



Snow -.-.- — 



Maximum precipitation in 24 hrs. ..1.97, 15th 

 Number of days with .01 or more 8 



Wind, in miles 



Total movement 3118 



Greatest daily movement 221, 29th 



Least daily movement ._ ..32, 14th 



Mean hourly velocity ... 4.3 



Maximum velocity 28, 21st 



Wind, direction 



Prevailing direction ....WNW 



North, days 5 



Northeast, days 1 



East, days 2 



Southeast, days 7 



South, days 2 



Southwest, days , 3 



West, days ....3 



Northwest, days 7 



Weather 



Mean relative humidity, percent ...76.5 



Mean cloudiness, percent - 54 



Number of clear days 10 



Number of fair days 10 



Number of cloudy days 10 



Number hours bright sunshine .174 



Percent of possible hours of bright 

 sunshine ...46.6 



Thunder and lightning 

 First frost 



30.45 

 29.57 

 30.06 



87.7 

 33.2 

 61.7 



54.5 



4.24 



10 



3271 



4.5 

 25.9 



WSW 



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; .52, 1914 



16, 1933; 3, 1903 



4,686, 1896; 1,414, 1894 



80, 1938 



70, 1934; 27, 1908, 1914 



19, 1932; 2, 1907, 1928 



19, 1908; 3, 1889 



20, 1934; 3, 1941 

 •255, 1916; 106, 1934 



Oct. 13; Aug. 22 



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 1944. 



