For the first time in over 140 years of weather records, Washington, D.C. (based on measurements at Reagan National airport) has received below average precipitation in each of the first seven months of the calendar year. The annual rainfall deficit has grown to over 7.5” . The normal rainfall through August 1 is 23.47”, whereas just 15.93” has fallen - making it the 5th driest year on record to date.
The string of 7 straight dry months - while unprecendented to kick off the calendar year - has been matched or exceeded on at least 9 occasions within a given year or overlapping two years. The most consecutive months with a rainfall deficit in Washington, D.C. is 10, occurring in both 1896-1897 and 1930-1931.
In Maryland, the fraction of the state in severe drought grew from 20 percent to 29 percent in the last week due to mounting precipitation deficits east of the Chesapeake Bay.
From central Virginia to the Mason Dixon line, the only area not classified as at least moderately dry is northern Maryland, adjacent to the Pennsylvania border.
The Drought Monitor also indicates D.C. proper is in moderate drought. However, sections of the city received appreciable rain in localized downpours in July - resulting in rainfall totals greater than regional averages.
Ian Livingston contributed to this report.