Monthly Summary 



April, 1983 



Barometer 



(Readings reduced to sea level) 



Maximum 30.49, 20th 



Minimum 29.35, 26th 



Mean semi-daily 29.995 



Range 1.14 



Air Temperature 



Highest 78, 30th 



Lowest 22, 23rd 



Mean 45.3 



Monthly range 56 



Highest mean daily 62, 29th 



Lowest mean daily 36, 12th 



Mean maximum 54.8 



Mean minimum 35.7 



Greatest daily range 37, 21st 



Least daily range 4, 12th 



Precipitation 



Precipitation. In inches 5.03 



Snow, in inches 6.00 



Maximum precipitation 24 hrs. 1.47, 



12th 

 Number of days on which .01 or more 

 inches of rain fell 15 



Wind (miles) 



Total movement 5,357 



Greatest daily movement 346, 5th 



Least daily movement 70, 21st 



Mean hourly velocity 7.4 



Maximum velocity for 5 min. 35, 4th, 5th 



(corrected to conform to 3 cup anemometer) 



Wind (direction) 



Prevailing direction nnw 



North, days 4 



Northeast, days 4 



East, days 3 



Southeast, days 4 



South, days 1 



Southwest, days 1 



West, days 4 j 



Northwest, days 9 



Weather 



Mean relative humidity, per cent . . 62.8 



Mean cloudiness, per cent 63 



Number of clear days 11 



Number of fair days 6 



Number of cloudy days 13 



Number of hours bright sunshine 185.5 

 Percent of possible hours of bright 



sunshine 46 



Frosts after the 15th: 20th, 21st, 22nd, 



23rd, 28th 

 Thunder and Lightning 



Normal 



30.48 



29.41 



29.99 



1.08 



79.5 

 21.6 

 45.8 

 57.8 



3.27 

 2.32 



11 



5,436 



7.5 

 29 



Extremes 



69.6 

 49.2 

 11 

 10 

 9 

 221 



55 



30.71, 1911 

 29.07, 1930 



1.52, 1930; 0.72, 1919 



88.5, 1896 

 8.5, 1923 



6.89, 1929; 0.76, 1892 

 11, 1891; 0, 1910 



18, 1909 ; 3, 1892 

 1,208 1908; 3,853, 1917 



39, 1916, 1931, 1932 



81.2, 1916; 54.5, 1892 



75, 1901; 34, 1925, 1927 



19, 1911; 3, 1898, 1902 



18, 1915; 2, 1894, 1901 



22, 1901; 3, 1899, 1924 



296, 1911; 103, 1901 



NoTn— The first column in the above summar.v gives observations made during the 

 month. The second column ei ves the averasjes based on observations made from I8i<9 to 

 Ktl-'s. The third column eives extremes observed from 1H8SI to UI32. 



