USGS - science for a changing world

Water Science for Maryland, Delaware and the District of Columbia


Monthly data from five Mid-Atlantic National Weather Service (NWS) stations were used to show the relation between monthly precipitation and monthly groundwater levels and streamflows. The NWS uses averages of data over the 30-year climate normal period from 1981 through 2010.


November 2018 Precipitation

Precipitation was above normal at the five Mid-Atlantic NWS weather stations in November. At the weather station in Baltimore, Maryland, precipitation was 8.41 inches, which is a November record high. The previous November record high was 7.68 inches in 1952. The long-term average November 2018 precipitation for the five Mid-Atlantic NWS weather stations is shown next to the November 2018 precipitation in the graph and map below.



The precipitation graph and map show November 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



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

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