Monthly Summary 



May. 1986 



Normal 



Barometer 



( Readings reduced to sea level) 



Maximum 30.62, 22nd 



Minimum 29.51, 28th 



Mean semi-daily 29.998 



Range 1.11 



Air Temperature 



Highest 91, 8th 



Lowest 32, 15th, 16th, 21st, 22nd 



Mean 59.4 



Monthly range 59 



Highest mean daily .... 72, 8th, 9th, 18th 



Lowest mean daily 44, 16th 



Mean maximum 72.5 



Mean minimum 46.2 



Greatest daily range 42, 23rd 



Least daily range 8, 3rd 



Precipitation 



Precipitation. In inches 1.76 



Snow, in inches 



Maximum precipitation in 24 hrs. 



.58, 3rd and 4th 

 Number of days on which .01 or more 



inches of rain fell 9 



Wind (miles) 



Total movement 4,389 



Greatest daily movement 329, 14th 



Least daily movement 65, 22nd 



Mean hourly velocity 5.9 



Maximum velocity for 5 min., 26, 14th 



Wind (direction) 



Prevailing direction wsw 



North, days 3 



Northeast, days 2 



East, days 



Southeast, days 7 



South, days 4 



Southwest, days 2 



West, days 8 



Northwest, days 5 



Weather 



Mean relative humidity, per cent. . 61.6 



Mean cloudiness, per cent 40.5 



Number of clear days 18 



Number of fair days 7 



Number of cloudy days 6 



Number of hours bright sunshine . 308 

 Percent of possible hours of bright 



sunshine 68 



Thunder and Lightning 3rd, 13th, 14th, 



27th 



Frosts 15th, 16th, 21st, 22nd 



Last Frosts 



30.38 

 29.51 

 29.95 



85.5 

 30.8 

 56.8 

 54.6 



Extremes 



3.63 



12 

 4,540 



6.1 

 25 



59.7 

 51.5 

 10 

 11 

 10 

 250.1 



55.2 



12th 



30.55, 1895 

 29.16, 1893 



1.21, 192£; O.GO, 1899 



94.5, 1911 

 24.0, 1900 



7.44, 1931; 0.48, 1903 



20, 1901; 5, 1903 

 5,946, 1907; 2,180, 1894 



45, 1935 



70, 1901; 30, 1923 



20, 1923; 0, 1927 



17, 1907, 1926; 5, 1923 



20, 1927; 3, 1903, 1922 



334, 1922; 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 1928, except that humidity records are based on observations made from 1929 to 1935. 

 The third column gives extremes observed from 1889 to 1985. 



