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December Normals for Marriottsville, MD

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 28 49 39 0.11 26 0 2 28 49 38 0.11 27 0 3 28 48 38 0.11 27 0 4 27 48 37 0.11 28 0 5 27 47 37 0.11 28 0 6 27 47 37 0.11 28 0 7 27 47 37 0.11 28 0 8 26 46 36 0.1 29 0 9 26 46 36 0.1 29 0 10 26 45 36 0.1 29 0 11 26 45 35 0.1 30 0 12 25 45 35 0.1 30 0 13 25 45 35 0.1 30 0 14 25 44 35 0.1 30 0 15 25 44 34 0.1 31 0 16 24 44 34 0.1 31 0 17 24 43 34 0.1 31 0 18 24 43 34 0.1 31 0 19 24 43 33 0.1 32 0 20 24 43 33 0.1 32 0 21 23 42 33 0.1 32 0 22 23 42 33 0.1 32 0 23 23 42 32 0.1 33 0 24 23 42 32 0.1 33 0 25 23 41 32 0.1 33 0 26 22 41 32 0.1 33 0 27 22 41 32 0.1 33 0 28 22 41 31 0.1 34 0 29 22 41 31 0.1 34 0 30 22 40 31 0.11 34 0 31 22 40 31 0.11 34 0 Month 25 44 34 3.19 952 0 Data Controls Monthly: January February March April May June July August September October November December   | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather