Average Precipitation for Maryland in December

The tables below give monthly averages for rainfall plus snowfall during December at cities, communities and other locations around Maryland.

Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

You can jump to a separate table for each region of the state: Eastern Shore, Central Maryland and Western Maryland.

Eastern Shore

Average monthly precipitation in December
Days Place Inches Milli­metres
11 Assateague Island 4.0 102
10 Chestertown 3.8 97
11 Ocean City 3.6 91
11 Royal Oak 3.9 100
11 Salisbury 3.7 93
10 Snow Hill 3.9 100

Central Maryland

December averages for total rainfall plus snowfall
Days Place Inches Milli­metres
10 Baltimore 3.7 94
10 Beltsville 3.5 88
10 Catoctin Mountain Park 3.5 89
9 Frederick 4.0 101
10 Laurel 3.9 100
9 Mechanicsville 4.0 101
10 Patuxent River 3.5 90
9 Rockville 3.4 86

Western Maryland

Average amount of rain and snow in December
Days Place Inches Milli­metres
11 Cumberland 3.1 77
13 Frostburg 3.4 87
9 Hagerstown 2.8 72
16 Oakland 4.3 109
11 Savage River Reservoir Dam 2.9 74
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Maryland Precipitation
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