MONTHLY SUMMARY 



July 1942 



Barometer, in inches 



(Readings reduced to sea level) 

 Maximum „ 3*^ .M 2'''th 



Minimum 29 f)5 6th 



Mean semi-dail\ 29 970 



Range 66 



Air Temperature, in degrees F. 



Highest „ 93, 19th 



Lowest 47, 9th 



Mean 70.5 



Range _ 46 



Highest mean daily - - 80, 19th 



Lowest mean daily _ 60.5, 11th 



Mean maximum _ 81.3 



M ean minimum 59.6 



Greatest daily range 33, 13th. 14th 



Least daily range 3, 27th 



Precipitation, in inches 



Precipitation _ _ 4.95 



Snow _ 



Maximum precipitation in 24 hrs 1.32, 27th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement „ J950 



Greatest daily movement _....255, 15th 



Least daily movement 45, 2nd, 25th 



Mean hour velocity _ 4.0 



Maximum velocity 25, 6th, 14th, I5th 



Wind, direction 



Prevailing direction „ W 



North, days _ 1 



Northeast, days 1 



East, days „ 



Southest, days 7 



South, days „ „ 3 



Southwest, days 2 



West, days „ 7 



Northwest, days 10 



Weather 



Mean relative humidity, percent 73.6 



Mean cloudiness, percent 59 



Number of clear days 14 



Number of fair days 11 



Number of cloudy days „ 6 



Number hours bright sunshine .291 



Percent of possible hours of bright 



sunshine 63 



Thunder and lightning 1st, 4th, 6th, 19th 



Normal 



Extremes 



30.27 



29.59 



29.96 



0.68 



93.9 

 46.4 

 70.8 



47.7 



4.10 



11 

 3422 



4.6 

 28.7 



SW 



58 



30.50, 1892 



29.27, 1932 



0.97, 1892; 0.47, 1938 



104, 1911 



40, 1890, 1898 



74.7, 1921; 66.3, 1891 



14.51, 1897; 0.70, 1929 



20; 1915; 4, 1924 



5097, 1909; 1109, 1894 



44, 193) 



Note — The first colunm 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. 



