Monthly Summary 



January I9;i9 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.52, 4th 



Minimum 29.20, 22nd 



Mean semi-daily 30.041 



Range 1.32 



Air Temperature, in degrees F. 



Highest 52, 10th 



Lowest -4, 27th 



Mean 24.9 



Monthly range 56 



Highest mean daily 43.5, 10th 



Lowest mean daily 8.0, 2r)th 



Mean maximum 33.0 



Mean minimum 10.7 



Greatest daily range 32, 22nd 



Least daily range 7, 11th, 31st 



Precipitation, in inches 



Precipitation 2.21 



Snow 4.75 



Maximum precipitation in 



24 hrs 1.34, 5th, 6th 



Number of days with .01 or more 8 

 Wind, in miles 



Total movement 5079 



Greatest daily movement .... 389, 23rd 



Least daily movement 25, 16th 



Mean hourly velocity 6.8 



Maximum velocity 44, 22nd 



Wind, direction 



Prevailing direction NW 



North, days 10 



Northeast, days 



East, days 



Southeast, days 



South, days 7 



Southwest, days 



West, days 4 



Northwest, days 10 



Weather 

 Mean relative humidity, percent 69.9 



Mean cloudiness, percent 57 



Number of clear days 17 



Number of fair days 10 



Number of cloudy days 4 



Number hours bright sunshine ....189 

 Percent of possible hours of 



bright sunshine 64.3 



Thunder and lightning 22n(l 



30.701 

 29.20 1 



30.07 

 1.5l| 



! 

 51.1 

 -7.1 

 24.2 

 58.2 



I 3.61 

 L3.24 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



66.0, 1932 



-26.0, 1904 



34.2, 1913; 13.9, 1918 



7.15, 1898; 1.07, 1896 

 33,1898, 1923; 1.75, 11 



5055; 7770, 1908; 2896, 1895 



6.8 

 32.7 



WNW 



47, 1938 



70.1 



55 



9 



9 



13 



137 



46.7 



78, 1932; 37, 1908 



16, 1932; 2, 1914 



18, 1890, 1926; 3, 1916 



22, 1923, 1931; 4, 1920 



214, 1920; 74, 1932 



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

 during the month. The second column gives the averages based on ob- 

 servations 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 1938. 



