MONTHLY SUMMARY 



MAY 1952 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.056, 19th 



Minimum 29.200, 12th 



Mean semi-daily 29.903 



Range 0.856 



Air Temperature, in degrees F. 



Highest 82, 28th 



Lowest 32, 3rd, 17th 



Mean ....56.1 



Range 50 



Highest mean daily 69, 29th 



Lowest mean daily 46, 3rd 



Mean maximum 67.9 



Mean minimum 44.3 



Greatest daily range 41, 28th 



Least daily range 8, 20th 



Degree-days of heating load for 



month 280.5 



Degree-days cumulative for season..6212.5 



Precipitation, in inches 



Precipitation 4.00 



Snow 



Maximum precip. in 24 hrs 1.07, 12th 



Number of days with .01 or more 10 



Wind, in miles 



Total movement 3561 



Greatest daily movement 288, 7th 



Least daily movement 10, 17th 



Mean hourly velocity 4.8 



Maximum velocity 25, 4th, 12th, 16th 



Wind, direction 



Prevailing direction NW 



North, days 3 



Northeast, days 4 



East, days ....0 



Southeast, days 4 



South, days : 2 



Southwest, days 5 



West, days 1 



Northwest, days 12 



Weather 



Mean relative humidity, percent 74.0 



Mean cloudiness, percent 54.4 



Number of clear days 11 



Number of fair days 12 



Number of cloudy days 8 



Number of hours bright sunshine 230.9 



Percent of possible hours of 



bright sunshine 51.1 



Last Frost May 17th 



30.39 



29.51 



29.96 



0.88 



86.1 

 31.2 

 57.1 

 54.9 



56.8 

 34.8 



3.60 



12 



4504 



6.1 

 28.8 



W 



60.7 



52.1 



11 



11 

 9 



252 



55.6 



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 



12, 1948; 30. 1923 



21, 1944; 0, 1927 



18, 1949; 5, 1923 



20, 1927; 2, 1941 



350, 1944; 137, 1927 



Note — The first column in the above summary lists observations made during the 

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

 1889 to 1938, except that humidity records are based on observations made from 

 1929 to 1938. The third column lists extremes observed from 1889 to 1951. 



