MONTHLY SUMMARY 



SEI'TEMBl'.k 1949 



Barometer, in inches 



(Reading'5 icduccd to sea level) 



Maximum 30.57,12th 



Minimum 29.42, 23rd 



Mean semi-daily 30.045 



Range 1.15 



Air Temperature . in Degrees F, 



Highest 86, 5th 



Lowest 35, 26th 



Mean 61.7 



Range 51 



Highest mean daily , . 75.5 14th 



1 owes I mean daily 51, 25th, 26th 



Mean maximum 71.7 



Mean minimum 51.7 



Cireati'St daily range 36, 3rd 



Least daily range 6, 28th 



Degree-days of hearing load for month. . 143 

 Dt'gree-days cumulative for season [A^ 



Precipitation, in inches 



Precipitation 3.55 



Snow 



Maximum precip. in 24 hrs 72 ,15th 



Number of days with .01 or more 12 



W ind, in miles 



Total movement 2643 



( ireatest daily movement 187, 6th 



Least daily movement 14, 29th 



Mean hourly velocity 3.7 



Maximum velocity 22, 24th 



Wind, direction 



l're\ ailing direction W NW 



North, da} s 5 



Northeast, days 7 



l'.ast,[days 1 



Southeast, days 



Suuth, days 5 



Southwest, days 7 



\\ est, days 2 



Northwest, days 3 



Weather 



Mean relative humidity, percent 76.2 



Mean cloudiness, percent 50.7 



Number of clear days 15 



Number of fair days 11 



Number of cloudy days 4 



Number of hours bright sunshine 230.5 



I'ercent of possible hours of 



bright sunshine 61.5 



Thunder and lightning 14th, 18th, 19th, 23rd 

 First Frost 26th 



Normal 



Extr 



30.45 

 29.57 

 30.00 



.88 



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 



Sent. 21 



30.65, 1924 

 28.41, 1938 



1.99, 1938; .57, 1910 



97, 1895, 1929 

 24.5, 1914 



14.55, 1938; .52, 1014 



16, 1933; 3, !%3 



4,686, 1896; 1,414, 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 gives observations made during the month, 

 'Ihe 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 1948. 



