MONTHLY SUMMARY 



February 1930 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum . . .' 30.60, 17th 



Minimum 29.62, 5th 



Mean semi-daily 30.065 



Range 98 



Air Temperature 



Highest 65.0, 20th 



Lowest -6.0, 6th 



Mean 29.2 



Monthly range 71.0 



Highest mean daily 51.3, 20th 



Lowest mean daily 4.0, 6th 



Mean maximum 38.7 



Mean minimum 19.7 



Greatest daily range 35.0, 12th 



Least daily range 9.0, 14th 



Precipitation 



Precipitation. In inches 1.39 



Snow, in inches 5.5 



Maximum precipitation in 24 hrs. .48, 



13th, 14th. 

 Number of days on which .01 or 



more inches of rain fell 9 



■Wind (miles) 



Total movement 3,800 



Greatest daily movement 294, 16th 



Least daily movement 42, 7th 



Mean hourly velocity 5.7 



Maximum velocity for 5 min .... 29, 16th 



(corrected to cunforni to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction sw 



North, days 



Northeast, days 



East, days • 



Southeast, days 10 



South, days 2 



Southwest, days 4 



West, days 7 



Northwest, days 5 



Weather 



Mean relative humidity, per cent . . 66.9 



Mean cloudiness, per cent 57.0 



Number of clear days 15 



Number of fair days 4 



Number of cloudy days 9 



Number of hours bright sunshine 179.6 

 Percent of possible hours of bright 



sunshine 61.0 



Thunder and lightning 



30.63 

 29.20 

 30.03 

 1.43 



50.3 

 -7.9 



23.5 

 58.2 



3.35 



14.27 



10 

 4,833 



7.1 

 29 



77.9 

 50.5 



10 

 8 



10 

 160 



54.4 



31.05, 1920 

 28.56, 1895 



1.89, 1900 ; 1908; .88, 1913 



57.5, 1890 

 -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 



42, 1912 



90, 1889; 66.8, 1902 



66, 1890, 1927; 31, 1905 



17, 1924; 2, 1927 



16, 1920 ; 3, 1890 



16, 1894 ; 2, 1920 



221, 1924; 110,1927 



.\'()TK— I'he first column in the above summary gives observations made during the 

 montli. The second and tliirtl columns ;_;ive the averages and extremes observed from 1S89 

 to 1929. 



