MONTHLY SUMMARY 



December !9SS 



Ndrmal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.85, 17th 



Minimum 29.30, 6th 



Mean semi-daily 30.052 



Range 1.55 



Air Temperature 



Highest 56, 4th 



Lowest 4, 3rd 



Mean 29.7 



Range 52 



Highest mean daily 43.5, 10th 



Lowest mean daily 15.5, 2nd 



Mean maximum 3'6.2 



Mean minimum 23.2 



Greatest daily range 27, 4th 



Least daily range .... 3, 9th, 18th, 19th 

 Precipitation 



Precipitation, inches 3.95 



Snow, inches 3.00 



Maximum precipitation in 



24 hrs 1.81, 5th, 6th 



Number of days on which .01 or 



more inches of precipitation fell 11 

 Wind (miles) 



Total movement 4571 



Greatest daily movement .... 420, 28th 



Least daily movement 25, 24th 



Mean hourly velocity 6.1 



Maximum velocity 48, 17th 



Wind (direction) 



Prevailing direction nw 



North, days 3 



Northeast, days 1 



East, days 



Southeast, days 1 



South, days 3 



Southwest, days 2 



We3t, days ...". 



Northwest, days 21 



Weather 

 Mean relative humidity, per cent 72 6 



Mean cloudiness, per cent 59 



Number of clear days 12 



Number of fair davs 4 



Number of cloudy days 15 



Number of hours bright sunshine 126 

 Per cent of possible hours of 



bright sunshine 44.5 



First snow Nov. 14 



30.65 



29.25 



30.056 



1.40 



54.5 

 -2.3 

 27.3 

 56.8 



3.47 

 8.99 



9 



4,726 



6.4 

 29 



I 68.9 



53.4 



8 



I 10 I 

 13 



[130.7 I 

 I 46.0 I 



Nov. 5 



30.96, 1889 

 28.85, 1915 



1.78, 1895; 1.01, 1892 



65.5, 1908 

 -22.5, 1917 



7.77, 1901; 0.87, 1896 

 26.50, '02; t, 1891 



17, 1902; 4, 1892 

 6,694, 1925; 3,239, 1918 



45, 1934 



71, 1929; 39, 1919 



15, 1890; 2, 1922, 1933 



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



19, '11, '22; 7, '09, '23 



172, 1896; 63.1, 1933 



Oct. 10, '25; Nov. 27, '31 



Note — The first column in the above summary gives observations made 

 dui-ing the month. The second colunm gives the averages based on ob- 

 servations made from 1889 to 1928, except that humidity records are 

 based on observations made from 1929 to 1937. The third column gives 

 extremes observed from 1889 to 1937. 



