Monthly Summary 



January, 1984 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.69, 4th 



Minimum 29.04, 28th 



Mean semi-daily 30.083 



Range 1.65 



Air Temperature 



Highest 43, 1st 



Lowest -5.0, 29th 



Mean 24 



Monthly range 48 



Highest mean daily 35.5, 23rd 



Lowest mean daily 1.5, 30th 



Mean maximum 31.2 



Mean minimum 16.8 



Greatest daily range 33, 29th 



Least daily range 3, 6th, 8th 



Precipitation 



Precipitation. In inches 3.50 



Snow, in inches 4.0 



Maximum precipitation in 24 hrs. 1.37, 



23rd 

 Number of days on which .01 or more 



inches of rain fell 8 



Wind (miles) 



Total movement 4,758 



Greatest daily movement .... 514, 29th 



Least daily movement, 32, 6th 



Mean hourly velocity 6.4 



Maximum velocity for 5 min., 40, 29th 

 21, Mar. 9 

 (corrected to conform to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction w 



North, days 



Northeast, days 1 



East, days 



Southeast, days 4 



South, days 4 



Southwest, days 3 



West, days 5 



Northwest, days 14 



Weatlier 



Mean relative humidity, per cent . . 64.3 



Mean cloudiness, per cent 60.5 



Number of clear days 5 



Number of fair days 10 



Number of cloudy days 16 



Number of hours bright sunshine . . 96.0 

 Percent of possible hours of bright 



sunshine 32 



Thunder and Lightning 



Frosts 



30.71 



29.18 



30.07 



1.54 



50.4 

 -7.4 

 23.8 

 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 



66.0, 1932 

 -26.0, 1904 



7.15, 1898; 1.07, 1896 

 33, 1898, 1923; 1.75, 1911 



18, 1923; 4, 1889 

 7,770, 1908; 2,896, 1895 



41, 1911 



87.7, 1920; 63.4, 1932, 1933 



78,1932; 37,1908 



16, 1922; 2, 1914 



18, 1890, 1926; 3, 1916 



22, 1923, 1931; 4, 1920 



214, 1920; 74.2, 1932 



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 

 1928. The third column gives extremes observed from 1889 to 1933. 



