MONTHLY SUMMARY 



March, 1947 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.47, 12th 



Minimum 28.63, 3rd 



Mean semi-daily 29.840 



Range -.- .._. .__ ....2.13 



Air Temperature, in degrees F. 



H ighest _ 55, 24th 



Lowest _ 11, 1st 



Alean .:..... 34.0 



Range — 44 



Highest mean daily ...46, 24th 



Lowest mean daily _..- .22.5, 26th 



Mean ma.ximum 42.6 



Mean minimum 25.3 



(Greatest daily range 30, 13th 



Least daily range 8, 4th. 30th 



Precipitation, in inches 



Precii)itation ..... . _ 3.2') 



Snow" .....3.00 



Maximum precip. in 24 hrs 1.72, 2nd 



Number of days with .01 or more 6 



Wind, in miles 



Total movement 5923 



Greatest daily movement 458, 26th 



Least daily movement 55, 1st 



Mean hourly velocity 7.9 



Maximum velocity 45, 3rd 



Wind, direction 



Prevailing direction WNW 



North, days 7 



Northeast, days 



East, days 



Southeast, days 2 



South, days . 3 



Southwest, days -.-. 3 



West, days ...7 



Northwest, days .9 



Weather 



Mean relative humidity, percent 62.9 



Mean cloudiness, percent 54 



Number of clear days 13 



Number of fair days ..9 



Number of cloudy days .9 



Number of hours bright sunshine .199 



Percent of possible hours of bright 



sunshine 53.6 



Thunder and lightning — 



Normal 



30.57 



29.24 



30.00 



1.34 



63.8 



6.1 



34.4 



57.6 



43.2 

 25.4 



3.70 

 7.47 



11 



5944 



7.7 

 31.2 



WNW 



64.2 



51.8 



11 



10 



10 



199 



53.6 



Extremes 



31.05, 1943 

 28.47, 1914 



2.10, 1914; 0.85, 1915 



85, 1929 

 -7.5, 1906 



7.89, 1942; 0.12, 1915 

 27, 1899; 0, 1921 



17, 1890, 1913, 1936; 3, 1915 



8182, 1896; 3006, 1905 



48, 1932, 1939, 1941, 1942 



68, 1901 ; 27, 1915 



292. 1924; 93. 1901 



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 1946. 



