Monthly Summary 



April. 1986 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.51, 9th 



Minimum 29.40, 3rd 



Mean semi-daily 30.009 



Range 1.11 



Air Temperature 



Highest 79, 29th 



Lowest 25, 25th 



Mean 43.4 



Monthly range 54 



Highest mean daily 66.5, 30th 



Lowest mean daily 34.5, 2nd 



Mean maximum 52.3 



Mean minimum 34.6 



Greatest daily range 39, 27th 



Least daily range 3, 2nd 



Precipilsit ion 



Precipitation. In inches 4.07 



Snow, in inches 0.50 



Maximum precipitation in 24 hrs. 



1.23, 5th and 6th 

 Number of days on which .01 or more 



inches of precipitation fell ... 15 



Wind (miles) 



Total movement 5,115 



Greatest daily movement 329, 6th 



Least daily movement 65, 12th 



Mean hourly velocity 7.1 



Maximum velocity for 5 min., 32, 6th 



Wind (direction) 



Prevailing direction w 



North, days 5 



Northeast, days 



East, days 



Southeast, days 5 



South, days 6 



Southwest, days 



West, days 9 



Northwest, days 5 



Weather 



Mean relative humidity, per cent. . 65.7 



Mean cloudiness, per cent 62.8 



Number of clear days 9 



Number of fair days ... 6 



Number of cloudy days .15 



Number of hours bright sunshine . 177 

 Percent of possible hours of bright 



sunshine 43.9 



Thunder and Lightning 15th 



Frosts after 15th 23rd, 25th, 27th 



3.27 

 2.32 



11 



5,436 



7.5 

 29 



60.8 

 49.2 



11 



10 



9 



221 



55 



6.89, 1929; 0.76, 1892 

 11, 1891; 0, 1910 



18, 1909; 3, 1892 

 ,208, 1908; 3,853, 1917 



40, 1935 



75, 1901; 34, 1925, 1927 



19, 1911; 3, 1898, 1902 



18, 1915; 2, 1894, 1901 



22, 1901; 3, 1899, 1924 



296, 1911; 103, 1901 



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

 month. The second column irives the averages based on observations made from 1889 

 to 19-.'s. except that humidit.v records are based on observations made from 19'29 to 1935. 

 The third column gives extremes observed from 1889 to 1985. 



