. The climate and weather of Baltimore . ollowing daysmay be of special interest: Jan. 1, 48 per cent. Feb. 22, 35 Mch. 4, 42 Mch. 21, 48 Apr. 30, 16 May 1, 29 J F M May 30, 35 per cent. July 4, 35 Sept. 1, 13 Sept. 12, 42 Dec. 25, 35 Thanksgiving Day 35 per cent. O Fig. 51.—The Monthly Amount of Precipitation. The upper line indicates the variations in the maximum monthly rainfall frommonth to month ; the middle line shows the mean monthly rainfall based on 30 years ofobservations ; the lower line shows the least monthly precipitation recorded during eachmonth in 30 years. The Monthly Precipi
. The climate and weather of Baltimore . ollowing daysmay be of special interest: Jan. 1, 48 per cent. Feb. 22, 35 Mch. 4, 42 Mch. 21, 48 Apr. 30, 16 May 1, 29 J F M May 30, 35 per cent. July 4, 35 Sept. 1, 13 Sept. 12, 42 Dec. 25, 35 Thanksgiving Day 35 per cent. O Fig. 51.—The Monthly Amount of Precipitation. The upper line indicates the variations in the maximum monthly rainfall frommonth to month ; the middle line shows the mean monthly rainfall based on 30 years ofobservations ; the lower line shows the least monthly precipitation recorded during eachmonth in 30 years. The Monthly usual method of representing the precipitation of any givenlocality is by means of monthly and annual amounts. Owing to thegreat variability in the character of rainfall and snowfall, a great manyyears of continuous observations made under practically imchangedexposure of the gauge are required. The vicinity of Baltimore has to its 186 THE CLIMATE OF BALTIMORE TABLE MONTHLY AND ANNUAL PRECIPITATION FOR 87 MARYLAND WEATHER SERVICE 187 TABLE XLVI CONT.—TOTAL MONTHLY AND ANNUAL PRECIPITATION FOR 87 YEARS. Year. ,232i51 Averages. 1821-1830 1 1831-1840 1841-18n0 1 1851-1860 1861-1870 1 1817-1870 1 1871-1903 i ! I •
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