MONTHLY SUMMARY 



FEBRUARY, 1951 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.850, 10th 



Minimum 29.200, 7th 



Mean semi-daily 30.161 



Range 1.650 



Air Temperature, in Degrees F. 



Highest 56, 27th 



Lowest — 6, 10th 



Mean 29.6 



Range 62 



Highest mean daily 45, 27th 



Lowest mean daily 7, 8th 



Mean maximum 38.3 



Mean minimum 21.0 



Greatest daily range 38, 1st 



Least daily range , 2, 8th 



Degree-days of heating load for month. . 990 

 Degree-days cumulative for season 4428 



Precipitation, in inches 



Precipitation 4.61 



Snow 6.0 



Maximum precip. in 24 hrs 1.33, 7th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 4088 



Greatest daily movement 471, 24th 



Least daily movement 2, 5th 



Mean hourly velocity 6.1 



Maximum velocity. .. . 32, 22nd; 23rd, 24th 



Wind, direction 



Prevailing direction NNW 



North, days 13 



Northeast, days 1 



East, days 



Southeast, days 



South, days 5 



Southwest, days 2 



West, days 1 



Northwest, days 6 



Weather 



Mean relative humidity, percent 79.0 



Mean cloudiness, percent 55.4 



Number of clear days 8 



Number of fair days 5 



Number of cloudy days 15 



Number of hours bright sunshine 99.0 



Percent of possible hours of 



bright sunshine 33.5 



Thunder and lightning 



First Frost 



Normal 



30.63 

 29.24 

 30.04 



1.38 



50.5 

 —7.4 

 23.7 

 58 



32.8 

 14.5 



1166.7 



3.19 

 13.99 



10 



4776 



7.1 



31.7 



WNW 



66.6 



50.9 



10 



8 



10 

 158 



53.4 



Extr 



31.05, 1920 

 28.56, 1895 



1.89, '00, '08; .88, '13, '31 



65.0, 1930 



—23, 1943 



32.6, 1890; 11.6, 1934 



8.12, 1900; 0.62, 1901 

 48.75, 1893; 0.50, 1937 



15, '93, 1920; 4, 1901 



6445, 1896; 3402, 1949 



50, 1946 



66, '90, '27; 31, 1905 



19, 1941; 2, 1927 



16, 1920; 2, 1936 



16, 1894; 2, 1920 



221, 1924; 110, '27, '38 



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 lecords are based on observations made from 1929 to 1938. The 

 third column gives extremes observed from 1889 to 1950. 



