Monthly Summary 



May. t984 



Normal 



Extremes 



Barometer 



(Readin.ns reduced to sea level) 



Maximum 30.52, 1st 



Minimum 29.48, 7th 



Mean semi-daily 29.983 



Range 1.04 



Air Temperature 



Highest 86, 22nd 



Lowest 32,9th 13th 



Mean 59.3 



Monthly range 54 



Highest mean daily 74.5, 22nd 



Lowest mean daily 47, 12th 



Mean maximum 71.5 



Mean minimum 47.1 



Greatest daily range 41, 1st 



Least daily range 7, 25th 



Precipitation 



Precipitation. In inches 3.42 



Snow, in inches 



Maximum precipitation in 24 hrs. 1.18, 



10th 

 Number of days on which .01 or more 



inches of rain fell 11 



Wind (miles) 



Total movement 4,360 



Greatest daily movement 276, 7th 



Least daily movement, 62, 4th 



Mean hourly velocity 5.9 



Maximum velocity for 5 min., 35, 22nd 

 (corrected to conform to ii cup anemometer) 



Wind (direction) 



Prevailing direction s 



North, days 1 



Northeast, days 3 



East, days 



Southeast, days 11 



South, days 3 



Southwest, days 1 



West, days 4 



Northwest, days 8 



Weather 



Mean relative humidity, per cent . . 58.6 



Mean cloudiness, per cent 53.4 



Number of clear days 16 



Number of fair days 9 



Number of cloudy days 6 



Number of hours bright sunshine 289.1 

 Percent of possible hours of bright 



sunshine 63.8 



Thunder and Lightning 22nd 



Frosts 8th, 9th, 13th 



Last frost 



30.38 

 29.51 

 29.95 



85.5 

 30.8 

 56.8 

 54.6 



3.63 



12 

 4,540 



6.1 

 25 



70.7 

 51.5 

 10 

 11 

 10 

 250.1 



55.2 



30.55, 1895 

 29.16, 1893 



1.21, 1929; 0.60, 1899 



94.5, 1911 

 24.0, 1900 



7.44, 1931; 0.48, 1903 



20, 1901; 5, 1903 

 5,946, 1907; 2,180, 1894 



35, 1912, 1929 



83.9, 1927; 53.8, 1932 



70, 1901; 30, 1923 



20, 1923; 0, 1927 



17, 1907, 1926; 5, 1923 



20, 1927; 3, 1903, 1922 



334, 1922; 137, 1927 



12th I 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 

 1928. The third column gives extremes observed from 1889 to 1938. 



