MONTHLY SUMMARY 



February 1940 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.46, 18th 



Minimum 29.07, 14th 



Mean semi-dailv 29.941 



Range .' 1.39 



Air Temperature, in degrees F. 



Highest 46, 12th 



Lowest -6, 27th 



Mean 26.7 



Range 52 



Hignest mean daily 39, 12th 



Lowest mean daily 7.5, 27th 



Mean maximum 34.9 



Mean minimum 18.4 



Greatest daily range 33, 23rd 



Least daily range 3, 19th 



Precipitation, in incties 



Precipitation 2.72 



Snow 155 



Max. precipitation in 24 hrs 1.01, 14th 



Number of days with .01 or more 9 



Wind, in miles 



Total movement 5459 



Greatest dail\- movement 572, 15th 



Least daily movement 34, 5th 



Mean hourly velocit>- 7 8 



Maximum velocity 40, 14th 



Wind, direction 



Prevailing direction NW 



North, days 9 



Northeast, days 



East, days 



Southeast, days 



South, days. 2 



Southwest, days 



West , days 6 



Northwest, days 12 



Weather 



Mean relative humidity, percent 77 8 



Mean cloudiness, percent 54 



Number of clear days 10 



Number of fair days 10 



Number of cloudy days 9 



Number hours bright sunshine 161 



Percent of possible hours of bright 



sunshine 54.4 



30.63 



29.24 



30.04 



1.38 



50.5 

 -7.4 

 23.7 

 58 



32.8 

 14.5 



3.19 

 13.99 



10 



4776 



7.1 

 31.7 



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; 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 1939 



