Monthly Summary 



June, 1930 



Barometer 



(Readings reduced to sea level) 



Maximum 30.33> 3rd, 12th 



Minimum •. 29.43, 27th 



Mean semi-daily 29.928 



Range 90 



Air Temperature 



Highest 92,5th 



Lowest 37, 1st 



Mean 70.6 



Monthly range 55 



Highest mean daily 76.5, 15th 



Lowest mean daily 56.0, 1st 



Mean maximum 82.7 



Mean minimum 58.5 



Greatest daily range 42, 3rd 



Least dailj' range 10, 9th 



Precipitation 



Precipitation. In inches 4.47 



Snow, in inches 



Maximum precipitation in 24 hrs. 



1.64, 9th 

 Number of days on which .01 or 



more inches of rain fell 13 



Wind (miles) 



Total movement 4,180 



Greatest daily movement 274, 10th 



Least daily movement 64, 24th 



Mean hourly velocity 5.8 



Maximum velocity for 5 min .... 32, 1st 



(corrected tn conform to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction se 



North, days 



Northeast, days 



East, days 2 



Southeast, days 19 



South, days 1 



Southwest, days 3 



West, days 2 



North v/est, days 3 



Weather 



Mean relative humidity, per cent. . 69.1 



Mean cloudiness, per cent 54 



Number of clear days 15 



Number of fair days 12 



Number of cloudy days 3 



Number of hours bright sunshine 314 

 Percent of possible hours of bright 



sunshine 69 



Thunder and lightning 6th, 26th 



Frosts 



Last frost 



Normal 



Extremes 



30.31 



29.56 



29.961 



0.75 



91.1 

 40.0 

 63.7 

 51.2 



3.54 



10 



3,584 



5 

 23 



73.9 

 50.1 



9 

 13 



8 

 257.4 



56 



30.54, 1889 

 29.24, 1902 



1.27, 1902; 0.52, 1916 



101, 1919 

 34, 1891 



9.68, 1922; 0.76, 1908 



17, 1922; 4, 1908 

 4,571, 1908; 1,409, 1906 



35, 1922 



85.9, 1922; 65.3, 1891 

 71, 1903 ; 28, 1908 



22, 1908; 1, 1907, 1926 



23, 1912; 4, 1895, 1903 



22, 1903; 1, 1923 

 362, 1908 ; 102, 1903 



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

 month. The second and third columns give the averages and extremes observed from 18J59 

 to 1929. 



