MONTHLY Summary 



February. 19S7 



Normal 



Extremes 



Barometer 



(Readings reduced tci sea level) 



Maximum 30.39, 20th 



Minimum 29.25, 14th, 15th 



Mean semi-daily 29.970 



Range 1.14 



Air Temperature 



Highest 55, 13th 



Lowest 6, 4th 



Mean 30.0 



Montiily range 49 



Highest mean daily 44.5, 13th 



Lowest mean daily 15, 2nd 



Mean maximum 37.5 



Mean minimum 22.4 



Greatest daily range 29, 12th, 19th 



Least daily range 4, 14th 



Precipitation 



Precipitation. In inches 2.23 



Snow, in inches 0.50 



Maximum precipitation in 24 hrs. 



1.03, 14th 

 Number of days on which .01 or more 



inches of precipitation fell .... 6 



Wind (n.ile>) 



Total movement 4,745 



Greatest daily movement 374, 22nd 



Least daily movement 29, 9th 



Mean hourly velocity 7.1 



Maximum velocity, 5 min., 48, 22nd 



Wind (direction) 



Prevailing direction wnw 



North, days 2 



Northeast, days 



East, days 1 



Southeast, days 2 



South, days 2 



Southwest, days 



West, days 7 



Northwest, days 14 



Weather 



Mean relative humidity, per cent. . 64.0 



Mean cloudiness, per cent 44.0 



Number of clear days 10 



Nun:iber of fair days 8 



Number of cloudy days 10 



Number of hours bright sunshine . . 138 

 Percent of possible hours of bright 

 sunshine 46.6 



30.63 



29.20 



30.03 



1.43 



50.3 



-7.9 

 23.5 

 58.2 



31.05, 1920 

 28.56, 1895 



1.89, 1900, 1908; 88, 1913, 1931 



3.35 

 14.27 



10 

 4,833 



7.1 

 29 



67.8 

 50.5 



10 

 8 



10 

 !160 



54.1 



65.0, 1930 

 -22.5, 1918 



8.12, 1900; 0.62, 1901 

 48.75, 1893; 2.5, 1912 



15, 1893, 1920; 4, 1901 

 6,445, 1896; 3,438, 1892 



45, 1933 



66, 1890, 1927; 31, 1905 



17, 1924; 2, 1927 



16,1920; 2, 1936 



16, 1894; 2, 1920 



,221, 1924; no, 1927 



Norr,— The first coluiun in tlie above suiuinaiy gives obsei vatioiis made during tbe 

 month. Tlie second column gives the averages based on observations made from 18H9 

 to 19'28, except that humidity records are based on observations made from 192i) to 1981; 

 The third column gives extremes observed from 1889 to 198(i. 



