Monthly Summary 



May. 198.-< 



Ncirmall 



Extremes 



Barometer 



( Readings reduced td sea levelj 



Maximum 30.43, 30tl,, 3lst 



Minimum 29.10, 15th 



Mean semi-daily 29.940 



Range 1.33 



Air Xeini»era(iirc 



Highest 77, 28th 



Lowest 34, 4th, 13th 



Mean 55.6 



R:inge 43 



Highest mean daily 65.5, 24th 



Lowest mean daily 45.0, 13th 



Mean maximum 67.3 



Mean minimum 43.9 



Greatest daily range .... 40, 4th 



Least daily range 3, 15th 



Precipitation 



Precipitation. In inches 3.81 



Snow, in inches 



Maximum precipitation in 24 hrs. 



2.11, 14th, 15Lh 

 Number of ddys o i which .01 or more 

 inches of precipitation fell 13 



Wind (miles) 



Total movement 3797 



Greatest daily movement .... 297, 16th 



Least daily movement 56, 8th 



Mean hourly velocity 5.1 



Maximum velocity, 5 min., 40, 13th, 15th 



Wind (direction) 



Prevailing direction sw 



North, days 1 



Northeast, days 



East, days 4 



Southeast, days 3 



South, days 



Southwest, days 



West, days 



Northwest, days 



9 



1 



7 



6 



Weather 



Mean relative humidity, per cent.. 61.6 



Mean cloudiness, per cent 53 



Number of clear days 11 



Number of fair days 15 



Number of cloudy days 5 



Number of hourrs bright sunshine . . 262 

 Percent of possible hours of bright 



sunshine 57.9 



Thundei- and lightning 6th, 7th, 10th 



Frosts 4th, 13th, 31st 



Last frost 



30.38 

 29.51 

 29.95 



88 



85.5 

 30.8 

 56.8 

 54.6 



3.63; 



12 

 4,540 



6.1 

 25 



60.6 



51.5 



10 



11 



10 



250.1 



55.2 



12th 



30.62, 1936 

 29.16, 1893 



1.21, 1929; 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 



45, 1935 



70, ]901; 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 erives the averaue.s based on observations made from 1889 

 to 1928, except that liiimidity records are based on observations made from 19'29 to 19.S7 

 The third column eives extremes observed from 1.H89 to 1987 



