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Normal Annual Snowfall Map
NWS Baltimore/Washington Forecast Office


About this Map:

The annual snowfall map was developed by the Baltimore/Washington National Weather Service Weather Forecast Office. The map was constructed from a combination of datasets including the 1981-2010 climate normals from the National Climatic Data Center (NCDC) ( and 1981-2010 PRISM data from Oregon State University ( Snowfall data, which was extracted from the NCDC climate normals dataset, represents the latest three-decade climate average at Cooperative Observer Program (COOP) stations. PRISM data uses a vast collection of point data as well as a digital elevation model to develop a gridded map of climate parameters. Interpolation methods in a Geographic Information System (GIS) were used to combine the NCDC snowfall data and gridded PRISM precipitation data, and subsequently develop a gridded map of normal annual snowfall for the Mid-Atlantic region. Select station snowfall values are rounded to the nearest whole number when displayed on the map.

National Weather Service
Weather Forecast Office Baltimore/Washington
43858 Weather Service Rd.
Sterling, VA 20166
Phone: (703) 996-2200
Page last modified: Jan 10, 2013 10:51 PM EST
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