MONTHLY SUMMARY 



MAY 1950 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.32, 9th 



Minimum _. 29.59, 13th 



Mean semi-daily 30.03 



Range 83 



Air Temperature , in Degrees F. 



Highest 85,6th 



Lowest 34, 8th, 9th 



Mean 57.9 



Range 51 



Highest mean daily 64.5, 30th, 31st 



Lowest mean daily . 43, 8th 



Mean maximum 68.6 



Mean minimum 46 



Greatest daily range 40, 9th 



Least daily range 3 ,1st. 



Degree-days of heating load for month . . 230 

 Degree-days cumulative for season. . . 6335 



Precipitation, in incties 



Precipitation 2.77 



Snow 



Maximum precip. in 24 hrs 0.45, 25th 



Number of days with .01 or more. 10 



Wind, in miles 



Total movement 3863 



Greatest daily movem.^nt 399, 8th 



Least daily movement 52, 12th 



Mean hourly velocity 5.4 mph 



Maximum velocity 48 mph, 7th 



Wind, direction 



Prevailing direction WSW 



North, days 5 



Northeast, days 2 



East, days 1 



Southeast, days 3 



South, days 6 



Southwest, days 6 



West, days 2 



Northwest, days 6 



Weather 



Mean relative humidity, percent 68.4 



Mean cloudiness, percent 58.3 



Number of ilear days 13 



Number of fair days 8 



Number of cloudy dajs 10 



Number of hours briplit sunshine 226.3 



Percent of possible hours of 



br'ght sunshine 50 



Thunder and lightning 



Last Snow 



Last Frost 



Normal 



30.39 

 29.51 

 29.96 



0.88 



86.1 

 31.2 

 57.1 

 54.9 



3.60 

 12 



4504 



6.1 



28.8 



60.7 



52.1 



11 



11 



9 



252 



55.6 



Extremes 



30.62, 1936 

 29.10, 1938 



94.5, 1896, 1911 

 24.0, 1900 



7.44, 1931; .48, 1903 

 20, 1901, 1945; 5, 1903 



5946, 1907; 2180, 1894 

 45, 1935 



72, 1948; 30, 1923 



21, 1944; 0, 1927 



18, 1949; 5, 1923 



20, 1927; 2, 1941 



3.50. 1944; 137, 1927 



Note — The first column In the above summary gives observations made during the month. 

 The second column gives the averages based on observations made from 1889 to 1938, 

 except that humidity lecords are based on observations made from 1929 to 1938. The 

 third column gives extremes observed from 1889 to 1949. 



