MONTHLY SUMMARY 



MAY, 1953 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.293, 4th 



Minimum 29.513, 18th 



Mean semi-daily 29.91 1 



Range 0.780 



Air Temperature, in degrees F. 



Highest 90, 11th 



Lowest 33, 4th 



Mean 59.7 



Range 57 



Highest mean daily 72.0, 12th 



Lowest mean daily 41.0, 2nd 



Mean maximum 70.5 



Mean minimum 48.9 



Greatest daily range 40, 4th 



Least daily range 3, 15th 



Degree-days of heating load for monthl89.5 

 Degree-days cumulative for season. . 5841.5 



Precipitation, in inches 



Precipitation 6.76 



Snow — 



Maximum precip. in 24 hrs 1.33 



Number of days with .01 or more 16 



Wind, in miles 



Total movement 2658 



Greatest daily movement 245, 28th 



Least daily movement 24, 11th 



Mean hourly velocity 3.6 



Maximum velocity 25, 18th, 23rd, 28th 



Wind, direction 



Prevailing direction WNW 



North, days 3 



Northeast, days — 



East, days 3 



Southeast, days 7 



South, days 4 



Southwest, days 2 



West, days 4 



Northwest, days 8 



Weather 



Mean relative humidity, percent 72.9 



Mean cloudiness, percent 62.6 



Number of clear days 12 



Number of fair days 13 



Number of cloudy days 6 



Number of hours bright sunshine. . . .235,7 

 Percent of possible hours of 



bright sunshine 52.1 



Thunder and lightning 7th, 8th, 12th, 23rd, 

 26th, and 27th 



Nor 



30.39 



29.51 



29.96 



0.88 



86.1 

 31.2 

 57.1 

 54.9 



56.8 

 34.8 



Extremes 



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 



72, 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 1952. 



