MONTHLY SUMMARY 



JANUARY, 19Si 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.660, 25th 



Minimum 29.401, 18th 



Mean semi-daily 30.065 



Range 1.259 



Air Temperature, in degrees F. 



Highest 48, 26th 



Lowest -7, 30th 



Mean 28.8 



Range 55 



Highest mean daily 40.5, 27th 



Lowest mean daily 6.5, 30th 



Mean maximum 35.9 



Mean minimum 21.7 



Greatest daily range 31, 31st 



Least daily range 3, 6th, 28th 



Degree-days of heating load for 



month 1122.5 



Degree-days cumulative for season. ..3542.0 



Precipitation, in inches 



Precipitation 4.02 



Snow 18.2 



Maximum precip. in 24 hrs 0.91, 25th 



Number of days with .01 or more 14 



Wind, in miles 



Total movement 3774 



Greatest daily movement 368, 21st 



Least daily movement - 4, 9th 



Mean hourly velocity 5.07 



Maximum velocity 40, 18th 



Wind, direction 



Prevailing direction NNW 



North, days 9 



Northeast, days 2 



East, days 2 



Southeast, days 1 



South, days 3 



Southwest, days 3 



West, days 1 



Northwest, days 10 



Weather 



Mean relative humidity, percent 82.7 



Mean cloudiness, percent 61.1 



Number of clear days 5 



Number of fair days 11 



Number of cloudy days 15 



Number of hours bright sunshine 102.7 



Percent of possible hours of 

 bright sunshine 34.9 



1265 



3.61 

 13.32 



11 



5055 

 6.8 



WNW 



70.1 



55 



9 



9 



13 



137 



40.7 



7.15, 1898; 1.07, 1896 

 Zi, 1898, 1923; 1.50, '08 



17, '50, '20; 4, 1901 



7770, 1908; 2896, 1895 



47, 1938 



78, 1932; 11, 1908 



20, 1944; 1, 1949 



18, 1890, 1926; 3, 1916, 1944 



II, 1923, '31, '49; 4, 1920, '39 



214, 1920; 50.4, 1949 



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 1951. 



