Monthly Summary 



May, 1988 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.24, l8th 



Minimum 29.51, 27th 



Mean semi-daily 29.943 



Range 0.73 



Air Temperature 



Highest 87, 19th 



Lowest 33, 5th 



Mean 60.5 



Monthly range 54 



Highest mean daily 71.5, 27th 



Lowest mean daily ... .48, 5th, 8th, 10th 



Mean maximum 72.7 



Mean minimum 48.4 



Greatest daily range 44, 18th 



Least daily range 10,10th 



Precipitation 



Precipitation. In inches 1.69 



Snow, in inches 



Maximum precipitation 24 hrs. .62, 



20th 

 Number of days on which .01 or more 

 inches of rain fell 7 



Wind (miles) 



Total movement 4,506 



Greatest daily movement 302, 4th 



Least daily movement 64, 28th 



Mean hourly velocity 6.1 



Maximum velocity for 5 min. 32,2nd,20th 



(corrected to conform to 3 cup anemometer) 



Wind (direction) 



Prevailing direction s 



North, days 1 



Northeast, days 1 



East, days 1 



Southeast, days 13 



South, days 2 



Southwest, days 



West, days 7 



Northwest, days 6 



Weather 



Mean relative humidity, per cent . . 60.9 



Mean cloudiness, per cent 61 



Number of clear days 12 



Number of fair days 12 



Number of cloudy days 7 



Number of hours bright sunshine 250.3 

 Percent of possible hours of bright 



sunshine 55 



Frosts, 5th, 8th, 11th 



Last Frosts 



Thunder and Lightning, 3rd, 20th, 27th 



30.38 

 29.51 

 29.95 



85.5 

 30.8 

 56.8 

 54.6 



3.63 



12 



4,540 



6.1 



25 



30.55, 1895 

 29.16, 1893 



1.16, 1893; 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 



83.9, 1927; 59.3, 1891 



70, 1901; 30, 1923 



20, 1923; 0, 1927 



17, 1907, 1926; 5, 1923 



20, 1927; 3, 1903, 1922 



334, 1922; 137, 1927 



J'e. 3, 1908; Apr. 23, 1904 



Note— The first column in the above summary gives observations made during the 

 month. Tlie second column gives the averages based on observations made from 188'J to 

 iy2». Tlie tliird column gives extremes observed from \m'J to 1'.I32. 



