ANNUAL SUMMARY 



Annual 1939 



Norma! 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.68, Feb. 16 and 17 



Minimum 29.20, Jan. 22 



Mean semi-daily 30.004 



Range 1-48 



Air Temperature, in degrees F. 



Highest 93, July 7 and 8 



Lowest - 4, Jan. 27 



Mean 48.0 



Range 97 



Highest mean daily 81, July 7, Aug. 21 



Lowest mean daily 8, Jan. 26 



Mean maximum 58.0 



Mean minimum 37.7 



Greatest daily range 45, May 19 



Least daily range 2, Oct. 31 



Precipitation, in inches 



Precipitation 38.82 



Snow 37.50 



Max. precipitation in 24 hrs. 2. 23,. Aug. 3, 4 

 Number of days with .01 or more 110 



Wind, in miles 



Total movement .^- • .51,734 



Greatest daily movement 478, Mar. 7 



Least daily movement 25, Jan. 16 



Mean hourly velocity 5.9 



Max. velocity, 48, Feb.4,16, Mar. 7, Junel? 



Wind, direction 



Prevailing direction V\ N\\ 



North, days 71 



Northeast, days 7 



East , da>-s 3 



Southeast, days 35 



South, days 63 



Southwest, days 33 



West, days 45 



Northwest, da\s 108 



Weather 



Mean relative humidity, percent 69.8 



Mean cloudiness, percent 54 



Number of clear days 155 



Number of fair days 123 



Number of cloudy days 87 



Number hours bright sunshine 2511 



Percent of possible hours of bright 



sunshine 56.4 



Last frost May 16 



First frost Oct. 15 



Last snow April 9 



First snow Nov. 9 



30.81 



28.95 



30.01 



1.85 



95.7 

 -12.2 



47.4 

 107.8 



57.8 

 36.5 



43.70 

 47.78 



124 



52,223 



58 

 39.5 



W 



31.05, 1920 

 28.41, 1938 



2.47. 1938; 1.38, 1933 



104 1911 



- 26, 1904 



49.8, 1921; 44, 1904 



59.00, 1938; 30.68 1908 

 89.00, 1893; 24.50, 1919 



144, 1902; 96, 1924 



63,571, 1908; 36,257, 1894 



80,1938 



60, '98, '01, '02; 41, '08, '24 



169, 1936; 59, 1927 



182, 1912; 64, 1936 



179, '01, '02; 71, 1910 



2838, 1924; 1864, 1902 



Apr. 23, '04; June 8, '32 



Aug. 22, '94, '95; Oct. 13, '09 



Mar. 14, '10; Mav 11, '07 



Oct. 10, '25; Nov. 27, '31 



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 1938. 



