MONTHLY SUMMARY 



JANUARY, 1950 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.696, 12tli 



Minimum 29.581, 14th 



Mean semi-daily 30.252 



Range 1.115 



26th 

 , 8th 

 .32.3 

 ,. 60 

 ,4th 

 ,8th 

 39.5 

 24.8 

 26th 

 21st 

 1015 

 3251 



Air Temperature , in Degrees F. 



Highest 65, 



Lowest 5 



Mean 



Range 



Highest mean daily 53 



Lowest mean daily 8 



Mean maximum 



Mean minimum 



Greatest daily range 32. 



Least daily range 5, 



Degree-days of heating load for month . 

 Degree-days cumulative for season. . . 



Precipitation, in inches 



Precipitation 4.33 



Snow 7.1 



Maximum precip. in 24 hrs 1.09, 10th 



Number of days with .01 or more P 



Wind, in miles 



Total movement 4036 



Greatest daily movement 339, 8th 



Least daily movement 9, 2nd 



Mean hourly velocity 5.4 



Maximum velocity 40, 11th, 14th 



Wind, direction 



Prevailing direction NW 



North, days 9 



Northeast, days 4 



East, days 



Southeast, days 2 



South, days 4 



Southwest, days 1 



West, days 7 



Northwest, days 4 



Weather 



Mean relative humidity, percent 79.9 



Mean cloudiness, percent 75.1 



Number of i lear days -^ 



Number of fair days '^ 



Number of cloudy days 19 



Number of hours bright sunshine 74.6 



Percent of possible hours of 



bright sunshine 25.4 



Thunder and lightning 



First Frost 



Normal 



30.70 



29.20 



30.07 



1.50 



51.1 

 -7.1 

 24.2 



58.2 



3.61 

 13.32 



11 



5055 



6.8 

 32.7 



WNW 



70.1 



55 



9 







13 



137 



46.7 



Extremes 



31.00, 1927 

 28.55, 1913 



2.18, 1913; 0.97, 1896 



66.0, 1932 



—26.0, 1904 



34.2, 1913; 13.9, VnS 



7.15, 1898; 1.07, 1896 

 33. 1898, 1923; 1.50, '08 



15, '93. '20; 4, 1901 



7770, 1908; 2896, 1895 



47, 1938 



78, 1932; 37, 1908 



20, 1944; 1, 1949 



18. 1890; 1926; 3, 1916, 1944 



22, 1923, '31, '49; 4, 1920. '39 



214, 1920; 50.4, 1949 



Note — The first column in the above summarj' gives observation* made during the month. 

 The second column gives the averages based on observations made from 1889 to 19.38, 

 except that humidity records are based on observations made from 1929 to 1938. The 

 third column gives extremes observed from 1889 to 1949. 



