MONTHLY SUMMARY 



January, 1942 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.51, 17tl 



Minimum 29.28, 2nd, 31st 



Mean .semi-daily 30.055 



Range 1.23 



Air Temperature, in degrees F. 



Highest 56, 2nd 



Lowest -13, 8th 



Mean 24.1 



Range 69 



Highest mean daily 45, 2nd 



Lowest mean daily 1 , 8th 



Mean maximum 33.4 



Mean minimum 14 



Greatest daily range 37, 14th 



Least daily range 5, 10th, 26th 



Precipitation, in inches 



Precipitation 3.54 



Snow 6 50 



Maximum precipitation in 24 



hrs. 1.41, 19th 



Number of days with .01 or more 7 



Wind, in miles 



Total movement 5289 



Greatest daily movement 475, 29th 



Least daily movement 13, 1st 



Mean liouily velocity 7.1 



Maximum velocity 35, 16th 



Wind, direction 



Prevailing direction NW 



North, days 6 



Northeast, days 



East, days 



Southeast, days 3 



South, days 5 



Southwest, days 2 



West, days 2 



Northwest, days 12 



Weather 



Mean relative humidity, percent 68.4 



Mean cloudiness, percent 58 



Number of clear days 14 



Number of fair days 8 



Number of cloudy days 9 



Number hours bright sunshine 159 



Percent of possible hours of bright 



sunshine 54.1 



Thunder and lightning 



30.70 



29.20 



30.07 



1.50 



51.1 



-7.1 

 24.2 



58.2 



3.61 

 13.32 



11 

 5055 



6.8 

 32.7 



WNW 



70.1 



55 



9 



9 



13 



137 



46.7 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



66.0, 1932 



-26.0, 1904 



34.2, 1913; 13.9, 1918 



7.15, 1898; 1.07, 1896 

 33, 1898, 1923; 1.50,'08 



15, '93, '20; 4, 1901 

 7770,1908; 2896,1895 



47. 1938 



78, 1932; 37, 1908 

 18, 1941; 2, 1914 

 18, 1890, 1926; 3, 1916 

 22, 1923. 1931; 4,1920, 1939 

 214, 1920; 74, 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 1938, except that humidity records are based on observations made from 

 1929 to 1938. The third column gives extremes observed from 1889 to 1941. 



