MONTHLY SUMMARY 



DECEMBER 1950 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.569, 7th 



Minimum 29.384. 4th 



Mean semi-daily 30.027 



Range 1.185 



Air Temperalure, in Degrees F. 



Highest 64, 4th 



Lowest —3, 27th, 28th 



Mean 29.1 



Range 67 



Highest mean daily 57.5, 4th 



Lowest mean daily 6.5, 27th 



Mean maximum 37.0 



Mean minimum 21.8 



Greatest daily range 33, 28th 



Least daily range 3, 26th 



Degree-days of heating load for monthl 114.0 

 Degree-days cumulative for season. . . 2333.5 



Precipitation, in inclies 



Precipitation 4.64 



Snow 8.5 



Maximum precip. in 24 hrs 1.81, 4th 



Number of days with .01 or more 9 



Wind, in miles 



Total movement 3289 



Greatest daily movement 410, 5th 



Least daily movement 0, 30th 



Mean hourly velocity 4.4 



Maximum velocity 32, 24th 



Wind, direction 



Prevailing direction WNW 



North, days 11 



Northeast, days 1 



East, days 



Southeast, days 1 



South, days 8 



Southwest, days 2 



West, days 4 



Northwest, days 4 



Weattier 



Mean relative humidity, percent 83.8 



Mean cloudiness, percent 57.4 



Number of clear days 8 



Number of fair days 7 



Number of cloudy days 16 



Number of hours bright sunshine.. . . . 100.6 

 Percent of possible hours of 



bright sunshine 35.6 



Thunder and lightning 



First Frost 



Normal 



30.66 

 29.27 

 30.06 



1.38 



54.3 

 1.09 



27.5 

 56.2 



3.39 

 8.50 



10 



4710 



6.3 

 31.4 



WNW 



69.4 



54.9 



8 



9 



14 



128 



45.2 



Nov. 6 



Extremes 



31.104, 1949 

 28.85, 1915 



1.78, 1895, 1.01, 1892 



65.5, 1908 



—22.5, 1917 



36.9, 1891; 17.1, 1917 



7.77, 1901; .58, 1943 

 26.50, 1902, T, 1891, 1943 



17, 1902; 4, 1892, 1943 



6,694, 1925; 3,239, 1918 



66, 1949 



71, 1929; 39, 1919 



15, 1890, 0.1948 



16, '09; 4, '89, '30, '31, '36, '38 



25, 1948; 7, '09, '23 



172, 1896; 27, 1948 



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 1949. 



