MONTHLY SUMMARY 



JULY 1949 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.32, 1st 



Minimum 29,70, 31st 



Mean semi-daily 29.982 



Range 0.62 



Air Temperalure, in Degrees F. 



Highest 97, 30th 



Lowest 53, 8th 



Mean 76.0 



Range 44 



Highest mean daily 84.5, 20th 



Lowest mean daily 68.0, 10th 



Mean maximum 87.3 



Mean minimum 64.7 



Greatest daily range 34, 1st 



Least daily range 10, 10th 



Degree-days of heating load for month. . 

 Degree-days cumulative for season. . . 



Precipitation, in inches 



Precipitation 3.41 



Snow 



Maximum precip. in 24 hrs 1.00, 13th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 2820 



Greatest daily movement 211, 23rd 



Least daily movement 34, 22nd 



Mean hourly velocity 3,8 



Maximum velocity 28, 20th 



Wind, direction 



Prevailing direction W 



North, days 4 



Northeast, days 7 



East, days 2 



Southeast, days 



South, days 



Southwest, days 13 



West, days 3 



Northwest, days 2 



Weather 



Mean relative humidity, percent 68.8 



Mean cloudiness, percent 44.2 



Number of clear days 12 



Number of fair days 15 



Number of cloudy days 4 



Number of hours bright sunshine 280.5 



Percent of possible hours of 



bright sunshine 60.5 



Thunder and lightning 



13th, 15th, 20th, 28th, 30th, 31st. I 



Normal 



30.27 



29.59 



29.96 



0,68 



93.9 

 46.4 

 70.8 

 47.7 



4.10 

 11 



3422 



4.6 



28.7 



SW 



68.4 



50.9 



10 



14 



7 



268 



58 



Extremes 



30.50, 1892 

 29.27, 1932 



0.97, 1892; 0.47, 1938 



104, 1911 



40, 1890, 1898 



74,7, 1921; 66.3, 1891 



14.51, 1897,;0.70, 1929 

 20, 1915; 4, 1924 



5097, 1909; 1109, 1894 

 44, 1936 



70, 1943; 31, 1924 



22, 1923; 0, 1915 



24, 1909, 1921; 4, 1946 



18, 1889; 0, 1910 



371, 1910; 180, 1931 



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. 



