MONTHLY SUMMARY 



January 1948 



January, 1948 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.53, 24th 



Minimum 29.34, 21st, 22nd 



A4ean semi-daily 30.087 



Range 1.19 



Air Temperature, in degrees F. 



Highest 39, 9th 



Lowest — 16, 24th 



Mean 18.0 



Range 55 



Highest mean daily 32.5, 13th 



Lowest mean daily —4.0 24th 



Mean maximum 27.1 



Mean minimum 8.S 



Greatest daily range 35. 29th 



Least daih' range 3, 13th 



Degree Days of Heating Load for month 1459 

 Degree Days cumulative for the Season 3932 



Precipitation, in inches 



Precipitation 2.63 



Snow 20.5 



Maximum precip. in 24 hrs 0.61, 2nd 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 4262 



Greatest daily movement 390, 10th 



Least daily movement 18, 16th 



Mean hourly velocity 5.7 



Maximum velocity 32, 9th, 10th 



Wind, direction 



Prevailing direction N W 



North, days 7 



Northeast, days 2 



East, days 1 



Southeast, days 1 



South, days 6 



Southwest, days 



West, days 3 



Northwest, days II 



Weather 



Mean relative humidity, percent 67.3 



Mean cloudiness, percent 82 



Number of clear days 10 



Number of fair days 12 



Number of cloudy days 9 



Number of hours bright sunshine 150 



Percent of possible hours of 



bright sunshine 51 



Snow ■^Q-5 



30.70 



29.20 



30.07 



1.50 



51.1 

 -7.1 

 24.2 



58.2 



1265 

 3817 



3.61 

 13.32 



11 



5055 



6.8 



32.7 



WNW 



70.1 



55 

 9 

 9 



13 

 137 



46.7 



Extremes 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



34.2, 



66.0, 1932 



—26.0, 1904 



1913; 13.9, 1918 



7.15. 1898; 1.07, 1896 

 33, 1898, 1923; 1.50, '08 



15, '93. '20; 4, 1901 



7770, 1908: 2896, 1895 



47, 19.^8 



78, 1932; 1>7 , 1908 



20.1944; 2, 1914 



18, 1890; 1926;3,1916, 1944 



22.1923,1931; 4,1920,1939 



214, P)20; 74, 1932 



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 1X89 to 1947. 



