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 are used to present monthly precipitation data to compare to the response of groundwater and streamflow. The NWS uses averages of data over the 30-year climate normal period from 1981 through 2010


June 2018 Precipitation

The long-term average May precipitation for the five Mid-Atlantic NWS weather stations is shown in the graph and map.



The precipitation graph and map show June 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)

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: