MONTHLY SUMMARY 



January 1941 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.60, 7th 



Minimum 29.50, 4th 



Mean .semi-daily 30.180 



Range 1.10 



Air Temperature, in degrees F. 



Highest 42, 23rd 



Lowest -9, 30th 



Mean 21.2 



Range 51 



Highest mean daily 34, 18th 



Lowest mean daily 4.5, 30th 



Mean maximum 29.9 



Mean minimum 12.5 



Greatest daily range 30, 8th 



Least daily range 2, 18th 



Precipitation, in inches 



Precipitation 2.21 



Hnow 22.75 



Maximum precipitation in 24 hrs. 1.05,24th 



Number of days with .01 or more 8 



Wind, in miles 



Total movement 4833 



Greatest daily movement 348, 13th 



Least daily movement 26, 9th 



Mean hourly velocity 6.5 



Maximum velocity 28, 19th, 20th, 29th 



Wind, direction 



Prevailing direction NNW 



North, days 10 



Northeast, days 



East, days 



Southeast, days 



South, days 2 



Southwest, days 1 



West, days 



Northwest, days 18 



Weather 



Mean relative humidity, percent 74.6 



Mean cloudiness, percent 56 



Number of clear days 18 



Number of fair days 8 



Number of cloudy days 5 



Number hours bright sunshine 191 



Percent of possible hours of bright 



sunshine 65.0 



Normal 



Extremes 



30.70 



29.20 



30.07 



1.50 



51.1 

 -7.1 

 24.2 



58.2 



3.61 

 13.24 



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 

 17,1939; 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 1940. 



