. The climate and weather of Baltimore . 3 0 43 43 1 39 44 4 44 42 1 44430 45 42 0 4342 2 43 43 1 42405 511 Minus Departures (—) 51 *» No Departures (0) 14 In most months the departure is likely to be about 1° above or below thenormal; in April the most probable departure is 2°, in October 3°, and inFebruary above 4°. Fifty-two per cent of the mean annual temperatures have fallen within1° of the normal value in the past 87 years, and in 37 per cent of theremaining years the mean was within 2° of the normal. No annualmean has risen to 4° above the normal and none fallen 4° below. Hencethe annua
. The climate and weather of Baltimore . 3 0 43 43 1 39 44 4 44 42 1 44430 45 42 0 4342 2 43 43 1 42405 511 Minus Departures (—) 51 *» No Departures (0) 14 In most months the departure is likely to be about 1° above or below thenormal; in April the most probable departure is 2°, in October 3°, and inFebruary above 4°. Fifty-two per cent of the mean annual temperatures have fallen within1° of the normal value in the past 87 years, and in 37 per cent of theremaining years the mean was within 2° of the normal. No annualmean has risen to 4° above the normal and none fallen 4° below. Hencethe annual mean temperature has a comparatively small range of depart-ure from the normal. The extreme departures occurred in 1822 (°above normal) and in 1836 (° below), iin extreme range of 7° between MARYLAND WEATHER SERVICE 101 the coldest and warmest years ou record at Baltimore. The frequency ofdepartures of stated values for the seasons is shown in the following table,in percentages of the total occurrences in 87 years:. Fig. 22. —Frequency of Stated Departures from the Monthly Normal Temperature. Fig. 23 shows the frequency of stated departures from the normal value of the monthlytemperatures, based on records covering- 87 years. The upper line of fig-ures represents thedegree of departure above (+) or below (—) the normal monthly temperature. The mar-ginal letters represent the months of the year. The curved lines and shaded areas representthe frequency of the changes expressed as percentages of total number of months. In-crease in intensity of shading represents increase in the frequency of stated changes. Forexample, changes of + 2 or —2 occurred in 10 per cent, of the total number of instances inMarch, 20 per cent, in May and August, 10 per cent, in December, etc. See also Fig. 23. FREQUENCY OF STATED SEASONAL DEPARTURES. Winter., V 2° 3 4° 5° 6° 7° 8° 9° % \% % % <fc % % % fo 19 29 17 19 lU 2 •i 3 0 33 27 26 « 4 2 0
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