Monthly Summary 



January, 1988 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.40, 29th 



Minimum 29.21, 25th 



Mean semi-daily 30.072 



Range 1.19 



Air Temperature 



Highest 58, 25th 



Lowest —12, 19th 



Mean 21.6 



R-nge 70 



Highest mean daily 43, 25th 



Lowest mean daily 3, 18th 



Mean maximum 31.2 



Mean minimum 11.9 



Greatest daily range 32, 19th 



Least daily range 6, 22nd 



Precipitation 



Precipitation. In inches 6.60 



Snow, in inches 18. £0 



Maximum precipitation in 24 hrs. 



2.26, 24th, 25th 

 Number of days on which .01 or more 



inches of precipitation fell .... 12 



Wind (miles) 



Total movement 3667 



Greatest daily movement .... 400, 25th 



Least daily movement 26, 20th 



Mean hourly velocity 4.9 



Maximum velocity, 5 min., ... 47, 25th 



Wind (direction) 



Prevailing direction nw 



North, days 2 



Northeast, days 



East, days 



Southeast, days 1 



South, days 6 



Southwest, days 1 



West, days 4 



Northwest, days 17 



Weather 



Mean relative humidity, per cent . . 69.9 



Mean cloudiness, per cent 62 



Number of clear days 9 



Number of fair days 8 



Number of cloudy days 14 



Number of hours bright sunshine . . 119 

 Percent of possible hours of bright 



sunshine 40.5 



Thunder and lightning 25th 



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 



70.1 



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 



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. except that humidity records are based on observations made from 1929 to 1937. 

 The third column gives extremes observed from 1889 te 1987 



