. The climate and weather of Baltimore . 5 ; 16 .. 17 .. 18 .. 1 19 .. 1 30 21 .. oo .. 23 .. 24 oil .. 35 .. 26 .. j The first column indicates the degree of change from day to day in theaverage daily temperature. The figures in the rem
. The climate and weather of Baltimore . 5 ; 16 .. 17 .. 18 .. 1 19 .. 1 30 21 .. oo .. 23 .. 24 oil .. 35 .. 26 .. j The first column indicates the degree of change from day to day in theaverage daily temperature. The figures in the remaining columns showthe average monthly, seasonal and annual frequency of occurrence of indi-cated changes, based upon observations during 30 years, from 1871 to 1900. The larger daily changes decrease in frequency on the approach of thesummer months. A change of 10° in the average temperature of twoconsecutive days ha? occurred about 3-5 times in 30 years during eachwinter month and 9 times in each of the months of Julv and Au2:ust. v_. MARYLAND WEATHER SERVICE 87 The details of these changes are shown in the table above and in , 19, 20 and 21. These figures and the diagrams reveal the interesting fact that theaverage departure and the most frequent departure are not identical, orthat the arithmetical mean of all departures for any given month is notthe most probable value. In the winter months the average departure isabout 1°, in the summer months it is about °. The most probabledeparture is in all months larger than the average departure, as is clearlybrought out in the following comparison of the average change from day today and the most probable change. DIURNAL VARIABILITY. Jan. Feb. Mar. Apr. 1May June July Aug. Sept. Oct. Nov. Dec. Year Average ±Most probablechange ± °3° °4° °2° ° ° °2° 2° ° 2° ° 2° °1° 3° °3° °3° °2° The true measure of diurnal variability is the change in the averagete
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