MONTHLY SUMMARY 



May 1942 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.31, 6th 



Minimum 29.77, 23rd 



Mean semi-daily 30.050 



Range 0.54 



Air Temperature, in degrees F. 



Highest 87, 30th 



Lowest -- ......31, 11th 



M ean 6 1 .4 



Range 56 



Highest mean daily ....74, 30th 



Lowest mean daily 47, 7th 



Mean ma.ximum 71.9 



Mean minimum 50.9 



Greatest daily range 27, 29th 



Least daily range 6, 7th, 21st 



Precipitation, in inches 



Precipitation 2.98 



Snow 



Maximum precip. in 24 hrs 1.19, I7th 



Number of days with .01 or more 10 



Wind, in miles 



Total movement 3799 



Greatest daily movement 265, 5th 



Least daily movement 48, 26th 



Mean hour velocity 5.1 



Maximum velocity 25, 12th 



Wind, direction 



Prevailing direction SSW 



North, days 7 



Northeast, days 



East, days 



Southeast, days 8 



South, days .7 



Southwest, days 3 



West, days 1 



Northwest, days 5 



Weather 



Mean relative humidity, percent 71 



Mean cloudiness, percent 57 



Number of clear days 13 



Number of fair days 10 



Number of cloudy days ...8 



Number hours bright sunshine 258 



Percent of possible hours of bright 



sunshine 57 



Thunder and lightning 



4th, 12th, 13th, 31st 



Last frost May 11 



30.39 



29.51 



29.96 



0.88 



86.1 

 31.2 

 57.1 

 54.9 



3.60 



12 

 4504 



6.1 

 28.8 



W 



60.7 



52.1 



11 



11 



9 



252 



55.6 



May 14 



30.62, 1936 

 29.10, 1938 



94.5, 1896, 1911 

 24.0, 1900 



7.44, 1931; .48, 1903 



20, 1901; 5, 1903 

 5946, 1907; 2180, 1894 



45, 1935 



70, 1901, 1902; 30, 1923 



20, 1923, 1941 ; 0, 1927 



17, 1907, 1926; 5, 1923 



20, 1927; 2, 1941 



338, 1941; 137, 1927 



June 8, 1932; Apr. 23, 1904 



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. 



