Annual Total Snowfall Across the Mid-Atlantic

This tool is excerpted from Chesapeake Bay Watershed Climate Impacts Summary and Outlook for Winter 2020-2021.

Key Findings

  • Annual snowfall in Maryland and Delaware has increased between 1981–2019 and decreased in Washington, D.C. over this period.
  • Portions of southern New York and northern and western Pennsylvania have experienced increases in annual snowfall.
  • Across the Mid-Atlantic region, between 1981–2019, the years 1996 and 2010 saw the highest average annual snowfall for the region, with 1996 seeing an average of 64 inches of total snowfall.

How to Use the Tool

Selecting Time Periods and Locations
Use the Time Period slider bar to adjust the years shown on the map and in the pop-out bar chart, which can be seen by hovering or tapping on a point. To select all snow gauges with available information in your location of interest, select the state, county or city from the dropdown list to the right on the map.

Technical Notes

NOTE: The station data shown in the map above are part of Global Historical Climate Network (GHCN) accessed via ACIS, the Applied Climate Information System that was developed and is maintained by the National Oceanic and Atmospheric Administration (NOAA) Regional Climate Centers. A majority of U.S. observations are from the NOAA National Weather Service (NWS) Cooperative Observer Network (COOP). The GHCN also includes data from the Community Collaborative Rain, Hail & Snow Network (CoCoRaHS).

Some locations in the tool may have only a few years of snowfall measurements available for a given decade, or only a few stations nearby. In these cases, decadal changes may reflect variability rather than trends. The number of years of snowfall measurements available for a given station and decade can be viewed by hovering your mouse over a given station. A chart will pop up with a bar chart that notes the number of years with data available.

  • Changes in Future Freeze-Thaw Days

    This tool is an interactive map of the Chesapeake Bay watershed that provides gridded estimates of percent changes in projected future (2011-2099) freeze-thaw days, compared to a modeled historic baseline (1981-2010).

View all the climate data tools