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December Normals for Chatham, MA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 32 47 39 0.13 26 0 2 31 46 39 0.13 26 0 3 31 46 39 0.13 27 0 4 31 46 38 0.13 27 0 5 30 45 38 0.13 27 0 6 30 45 37 0.13 28 0 7 30 45 37 0.13 28 0 8 29 44 37 0.13 28 0 9 29 44 37 0.13 28 0 10 29 44 36 0.13 29 0 11 28 43 36 0.13 29 0 12 28 43 36 0.13 29 0 13 28 43 35 0.13 30 0 14 27 43 35 0.13 30 0 15 27 42 35 0.13 30 0 16 27 42 34 0.13 31 0 17 26 42 34 0.13 31 0 18 26 42 34 0.13 31 0 19 26 41 34 0.13 31 0 20 26 41 33 0.13 32 0 21 25 41 33 0.13 32 0 22 25 41 33 0.13 32 0 23 25 41 33 0.14 32 0 24 25 40 33 0.14 32 0 25 24 40 32 0.14 33 0 26 24 40 32 0.14 33 0 27 24 40 32 0.14 33 0 28 24 40 32 0.14 33 0 29 24 39 31 0.14 34 0 30 23 39 31 0.14 34 0 31 23 39 31 0.14 34 0 Month 27 42 35 4.12 940 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