MONTHLY SUMMARY 



January, 1943 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.65, 29th, 30th 



Minimum 29.36, 15th 



Mean semi-daily 30.066 



Range .1.29 



Air Temperature, in degrees F. 



Highest .......42, 31st 



Lowest , -4, 8th 



M ean __ ...2 1 .4 



Range — 46 



Highest mean daily _.— — 35, 25th 



Lowest mean daily _.. _— 6.5, 21st 



Mean maximum .__. 29.1 



Mean minimum - 13.6 



Greatest daily range : 34, 11th 



Least daily range ...2, 18th 



Precipitation, in inches 



Precipitation — - 2.92 



Snow 19.25 



Maximum precipitation in 24 hrs.^..-0.93, 28th 

 Number of days with .01 or more 11 



Wind, in miles 



Total movement 4874 



Greatest daily movement _. 344, 20th 



Least daily movement 41, 10th 



Mean hourly velocity 6.6 



Maximum velocity — - -32, 19th 



Wind, direction 



Prevaihng direction WNW 



North, days 



Northeast, days - 



East, days — - 



Southeast, days 2 



South, days 4 



Southwest, days 



West, days - -6 



Northwest, days 19 



Weather 



Mean relative humidity, percent 73.3 



Mean cloudiness, percent .-63 



Number of clear days 15 



Number of fair days .9 



Number of cloudy days — -.7 



Number hours bright sunshine ......174 



Percent of possible hours of bright 



sunshine - 59.2 



Thunder and lightning 



Normal 



30.70 



29.20 



30.07 



1.50 



51.1 

 -7.1 

 24 2 



58^2 



WNW 



70.1 



55 



9 



9 



13 



137 



46.7 



Extremes 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



66.0, 1932 



-26.0, 1904 



34.2, 1913; 13.9, 1918 



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 tliat humidity records are based on observations made 

 from 1929 to 1938. The third column gives extremes observed from 1889 to 1942. 



