Monthly summary 



January, 1981 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.48, 15th 



Minimum 28.96, 6th 



Mean semi-daily 29.974 



Range 1.52 



Air Temperature 



Highest 49, 27th 



Lowest -9, 16th 



Mean 22.9 



Monthly range 58 



Highest mean daily 34, 27th 



Lowest mean daily 9.5, 16th 



Mean maximum 32.8 



Mean minimum 12.9 



Greatest daily range 37, 25th 



Least daily range 8, 15th 



PrecipKalion 



Precipitation. In inches 3.58 



Snow, in inches 20.75 



Maximum precipitation in 24 hrs. .88 



19th 

 Number of days on which .01 or 



more inches of rain fell 7 



Wind (miles) 



Total movement 4,256 



Greatest daily movement 362, 7th 



Least daily movement 45, 29th 



Mean hourly velocity 5.7 



Maximum velocity for 5 min 39, 7th 



(corrected to conform to 3 cup anemometer) 

 Wiiul (direction) 



Prevailing direction wnw 



North, days 1 



Northeast, days 1 



East, days 



Southeast, days 5 



South, days 2 



Southwest, days 2 



West, days 6 



Northwest, days 14 



Weather 



Mean relative humidity, per cent . . 73.4 



Mean cloudiness, per cent 51 



Number of clear days 12 



Number of fair days 8 



Number of cloudy days 11 



Number of hours bright sunshine 152 

 Percent of possible hours of bright 



sunshine 52 



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 column gives averages based on observations made from 1889 to 1928. 

 Tiie third column gives extremes observed from i8Sq to 1930. 



