Monthly Summary 



January 1930 



Normal 



Extremes 



Baromeier 



(Readings reduced to sea level) 



Maximum 30.77, 5th 



Minimum 29.74, 18th 



Mean semi-daily 30.225 



Range 1.03 



Air Temperature 



Highest 56.0, 8th 



Lowest -4.0, 27th 



Mean 26.0 



Monthly range 60.0 



Highest mean daily 50.5, 8th 



Lowest mean daily 9.5, 27th 



Mean maximum 33.1 



Mean minimum 17.3 



Greatest daily range 27.0, 27th 



Least daily range 3.0, 15th 



Precipitation 



Precipitation. In inches 2.57 



Snow, in inches 9.5 



Maximum precipitation in 24 hrs. .77, 



18th. 

 Number of days on which .01 or 



more inches of rain fell 13 



Wind (miles) 



Total movement '4,222 



Greatest daily movement 261, 4th 



Least daily movement 39, 27th 



Mean hourly velocity 5.7 



Maximum velocity for 5 min 39, 9th 



(Corrected to conform to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction sw 



North, days 



Northeast, days 



East, days 1 



Southeast, days 8 



South, days 4 



Southwest, days 3 



West, days 10 



Northwest, days 5 



Weather 



Mean relative humidity, per cent . . 74.1 



Mean cloudiness, per cent 69.3 



Number of clear days 10 



Number of fair days ... 6 



Number of cloudy days 15 



Number of hours bright sunshine 116.8 

 Percent of possible hours of bright 



sunshine 39.7 



Thunder and lightning 



30.71 

 29.18 

 30.07 

 1.54 



50.4 

 -7.4 



24.1 

 58.2 



3.42 

 13 



11 

 5,068 



6.8 

 30 



78.2 



54 



8 



10 



13 



140 



47.6 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



61.5, 1890 

 -23.0, 1907 



7.15,1898; 1.07,1896 

 33, 1898, 1923 ; 1.75, 1911 



18, 1923 ; 4, 1889 

 7,770, 1908; 2,896, 1895 



40, 1913 



85.3, 1927; 68.2, 1890 



66, 1898; 38, 1922 



16, 1922; 2, 1914 



18, 1890, 1926 ; 3, 1916 



22, 1923 ; 4, 1920 



214, 1920; 76, 1923 



Note— The first column in the above summary gives observations made during the 

 month. The second and third columns give the averages and extremes observed from 18S9 

 to 1929. 



