MONTHLY SUMMARY 



JUNE 1951 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.103, 12th 



Minimum 29.738. 27th 



Mean semi-daily 29.93 1 



Range 365 



Air Temperalure, in Degrees F. 



Highest 88, 1st, 19th 



Lowest 39, 8th 



Mean 77.2 



Range 49 



Highest mean daily 82.5, 24th 



Lowest mean daily 52, 15th 



Mean maximum 76.5 



Mean minimum 55.3 



Greatest daily range 35, 1st, 8th 



Least daily range 4, 14th 



Degree-days of heating load for month. . . 68 

 Degree-days cumulative for season 6100 



Precipitation, in inches 



Precipitation 3.04 



Snow — 



Maximum precip. in 24 hrs 1.42, 14th 



Number of days with .01 or more 9 



Wind, in miles 



Total movement 2803 



Greatest daily movement 210 25th 



Least daily movement 38. 6th 



Mean hourly velocity 3.9 



Maximum velocity 28, 7th, 10th 



Wind, direction 



Prevailing direction SSW 



North, days 6 



Northeast, days 1 



East, days 



Southeast, days 6 



South, days 8 



Southwest, days 4 



West, days 2 



Northwest, days 3 



Weather 



Mean relative humidity, percent 77.2 



Mean cloudiness, percent 59.3 



Number of clear days 6 



Number of fair days 10 



Numberof cloudy days 14 



Number of hours bright sunshine 178.5 



Percent of possible hours of 



bright sunshine 3">.0 



Thunder and Lightning 



Last Frost 



Normal 



30.30 



29.55 



29.95 



0.75 



91.2 

 40.0 



65.7 

 51.3 



3.75 

 11 



3585 



5.0 

 24.6 



WSW 



Extremes 



66.9 



51.1 



10 



12 



8 

 257 



54.0 



30.70, 1947 

 29.24, 1902 



101, 1919 

 34, 1891 



9.68, 1922; 0.76, 1908 

 17, 1922, 1945; 4, 1908 



4571, 1908; 1409, 1906 

 48. 1939 



71. 1903; 28. 1908 



22, 1908. 1941, 1943; 0, 1949 



23, 1912; 3, 1941 



22, 1903; 1. 1923 



365, 1947; 102, 1903 



Note — The first column In the above summarj' 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 1950. 



