MONTHLY SUMMARY 



August, 1947 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.35, 17th, 18th 



Minimum 29.80, 1st 



Mean semi-daily 30.097 



Range 0.55 



Air Temperature, in degrees F. 



Highest 95, 14th, 15th, 25th 



Lowest 48, 2nd 



Mean 73.0 



Range 47 



Highest mean daily 84.5, 14th 



Lowest mean daily 62.5, 2nd 



Mean maximum 84.5 



Mean minimum 61.5 



Greatest daily range 35, 11th 



Least daily range 13, 9th, 16th, 17th 



Precipitation, in inches 



Pre -ipitation 1.69 



Snow — 



Maximum precip. in 24 hrs 0.95, 26th 



Number ol days with .01 or more 6 



Wind, in miles 



Total movement 2820 



Greatest daily movement 160, 26th 



Least daily movement 52, 28th 



Mean hourly velocity 3.8 



Maximum velocity 25, 29th, 31st 



Wind, direction 



Prevailing direction SSW 



North, days 1 



Northeast, days >. 6 



East, days 1 



Southeast, days 5 



South, days 4 



Southwest, days 6 



West, days 6 



Northwest, days 2 



Weather 



Mean relative humidity, percent 80.4 



Mean cloudiness, percent 33 



Number of clear days 12 



Number of fair days 11 



Number of cloudy days 8 



Number of hours bright sunshine 243 



Percent of possible hours of 



bright sunshine 5().6 



Thunder and lightning 26th 



First frost — 



30.32 



29.61 



30.00 



0.71 



91.6 

 43.4 

 68.6 

 48.1 



4.08 

 11 



3127 



4.2 



22.7 



SW 



70.2 

 49.7 



13 



237 

 55.2 

 Sept. 21 



30.50, 1934 



28.87, 1930 



100, 1918 



34, 1940 



62.4, 1903 



8.40, 1928; .31, 1894 

 16, 1892, 1933; 4, .1899 



4,271, 1910; 1,920, 1894 

 40, 1941 



67, 1901. 1946; 27, 1923 



23, 1941; 0, 1915, 1929 



25, 1912; 3, 1939 



18, 1901, '28; 2, 1910, "23 



332, 1941: 152, 1915, 1929 



Aug. 22,'94,'95;Oct. 13, '09 



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 1946. 



