MONTHLY SUMMARY 



February 1939 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.68, 16th, 17th 



Minimum 29 . 26, 15th 



Mean semi-daily 30. 104 



Range .' 1.42 



Air Temperature, in degrees F. 



Highest 62, 20th 



Lowest 0, 17th 



Mean 27.8 



Range 62 



Highest mean daily 48, 20th 



Lowest mean daily 15.5, 17th 



Mean maximum 36.7 



Mean minimum 18.9 



Greatest daily range 32, 1st 



Least daily range 4, 26th 



Precipitation, in inches 



Precipitation 3 . 62 



Snow 6 . 00 



Maximum precipitation in 24 hrs. . . 97, 26th 

 Number of days with .01 or more 13 



Wind, in miles 



Total movement 4097 



Greatest daily movement 433, 16th 



Least daily movement 50, 14th 



Mean velocity 6.1 



Maximum velocity 48, 4th. 16th 



Wind, direction 



Prevailing direction WNW 



North, days 5 



Northeast, days 



East, days 



Southeast, days 1 



South, days 6 



Southwest, days 2 



West , days 1 



Northwest, days 13 



Weather 



Mean relative humidity, percent 73 .3 



Mean cloudiness, percent 59 



Number of clear days 15 



Number of fair days 6 



Number of cloudy days 7 



Number hours bright sunshine 173 



Percent of possible hours of bright 



sunshine 58.4 



Thunder and lightning 



30.63 



29.24 



30.04 



1.38 



50, 



-7, 

 23 

 58 



WNW 



66.6 



50.9 



10 



8 



10 

 158 



53.4 



31.05, 1920 

 28.56, 1895 



1.89, '00, '08; .88, '13, '31 



65.0, 1930 

 -22.5, 1918 



8.12, 1900; 0.62, 1901 



48.75, 1893; 0.50, 1937 



15, '93, '20; 4, 1901 



6445, 1896; 3438, 1892 



48, 1934, 1937 



66, '90, '27; 31, 1905 



17, '19, '24; 2, 1927 



16, 1920; 2, 1936 



16, 1894; 2, 1920 



221, 1924; 110, '27, '38 



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. 



