MONTHLY SUMMARY 



MAY 1949 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.32, 4th 



Minimum 29.64, 23rd 



Mean semi-daily 29.98 



Range 0.68 



Air Temperature, in Degrees F. 



Highest 92, 5th 



Lowest 34, 13th 



Mean 60.0 



Range 58 



Highest mean daily 76.0, 19th 



Lowest mean daily 50.0, 30th 



Mean maximum 72.7 



Mean minimum 47.1 



Greatest daily range 41, 5th 



Least daily range 10, 2nd 



Degree-days of heating load for month. . 190 

 Degree-days cumulative for season .... 5551 



Precipitation, in inclies 



Precipitation 4.76 



Snow 



Maximum precip. in 24 hrs 1.56, 24th 



Number of days with .01 or more 14 



Wind, in miles 



Total movement 3663 



Greatest daily movem^^nt 214, 2nd 



Least daily movement 35, 31st 



Mean hourly velocity 4.9 



Maximum velocity 40, 5th, 28th 



Wind, direction 



Prevailing direction W 



North, days 3 



Northeast, days 4 



East, days 3 



Southeast, days 1 



South, days 2 



Southwest, days 9 



West, days 9 



Northwest, days 



Weather 



Mean relative humidity, percent 69,5 



Mean cloudiness, percent 54.7 



Number of i lear days 1 



Number of fair days 18 



Number of cloudy days 12 



Number of hours bright sunshine 150.9 



Percent of possible hours of 



br'ght sunshine 33.4 



Thunder and ligh tnine 



1st, 5th, 18th, 19th, 24th 25th 



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 



W 



Extremes 



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, 18'H 

 45, 19 V.- 



72, 1948; 30, 1923 



21, 1944; 0, 1927 



17, 1907. 1926; 5, 1923 



20, 1927; 2, 1941 



350, 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 records are based on observations made from 1929 to 1938, The 

 third column gives extremes observed from 1889 to 1948. 



