. The climate and weather of Baltimore . f May, etc. The same results are shown in curves Bof Plates III and IV. These values are based on daily average temperaturesfor a period of thirty years. Average Inter-Diurnal Changes of Temperature. The changes in the average temperature from day to day are indicatedwith greater accuracy in Table XV than in the curves on Plates III andIV. The amount of rise or fall in temperature from day to day through-out the year is given to tenths of a degree. The average variability is 80 THE CLIMATE OF BALTIMORE approximately °, and varies from ° or ° in
. The climate and weather of Baltimore . f May, etc. The same results are shown in curves Bof Plates III and IV. These values are based on daily average temperaturesfor a period of thirty years. Average Inter-Diurnal Changes of Temperature. The changes in the average temperature from day to day are indicatedwith greater accuracy in Table XV than in the curves on Plates III andIV. The amount of rise or fall in temperature from day to day through-out the year is given to tenths of a degree. The average variability is 80 THE CLIMATE OF BALTIMORE approximately °, and varies from ° or ° in the winter monthsto ° or ° in the summer months when the changes are consideredwithout reference to sign. The month of greatest variability is March,while July is the month of least variability. The annual march of tem-perature shows some interesting periods of marked rise and fall, per-iods of three or more days during which there is a conspicuous departurefrom the path representing a steady progressive change. Such periods. Fig. is.—luter-diurnal Temperature Changes. Fig. 18 shows the average monthly frequency of changes of stated amounts in the meantemperature of the day from day to day. The marginal figures indicate the degree ofchange, and the heavy curved lines the frequency of stated changes. For example, a changeof 2° in the mean daily temperature occurs on the average 3-3 times in January, times inFebruary. times in June, and times in August, etc. Increase in the intensity of theshading represents increase in the frequency of occurrence. See also Table XVJI. have received a great deal of attention from European climatologists andthere is an abundant literature of a popular as well as scientific charactergrouped about these special days. Throughout central and southern Eu-rope there is a popular impression that injurious frosts are likely to occur
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