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Water Science for Maryland, Delaware and the District of Columbia

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January 2018 Weather

Data from five Mid-Atlantic NWS stations are used to present monthly precipitation and temperature data. The NWS uses averages of data over the 30-year climate normal period from 1981 through 2010.

During drought periods, the status from the National Drought Mitigation Center (U.S. Drought Monitor) and the Maryland Department of the Environment (MDE) is included.

January 2018 Precipitation

January precipitation was below the long-term average at five Mid-Atlantic NWS weather stations. Precipitation was lowest in Arlington, Virginia, with 0.94 inches, or 1.87 inches below the long-term average. The highest precipitation in January was in Georgetown, Delaware, with 2.85 inches, which is 0.07 inches below the long-term January average.

The precipitation graph and map show January precipitation and the departure from the 30-year climate normal from 1981-2010.


The precipitation graph and map show January 2018 precipitation and the departure from the 30-year climate normal.

*The NWS normal (long-term average) period used for determining records is from 1981–2010



January 2018 Temperatures

January temperatures at four of the five Mid-Atlantic NWS stations were below the climate normal and ranged from 31.2 to 35.7 degrees Fahrenheit. The temperature at Hagerstown, Maryland was the lowest of the five weather stations, but above the long-term average and it was only 0.1 degrees cooler than the temperature at Wilmington, Delaware. Temperatures are typically colder in the mountains of Maryland than along the coast. The highest temperature was in Arlington, Virginia at 35.7 degrees.



*Note from the National Weather Service: December 2011 was the first month to incorporate the new 1981-2010 climate normals that were calculated by the National Climatic Data Center. The new normals replaced the 1971-2000 normals.

January 2018 Drought Status

The U.S. Drought Monitor shows that in Maryland, as of January 30, 2018, 11.37 percent of the state was in severe drought, 33.40 percent was in moderate drought, and 38.80 percent was classified as abnormally dry.



In Delaware, 59.49 percent of the state was classified as abnormally dry.

In the District of Columbia, 100 percent was in severe drought status.

National Weather Service MD and DC
National Weather Service DE
Middle Atlantic River Forecast Center (MARFC)

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