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December Normals for Decatur, MS

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 39 62 50 0.18 15 -- 2 39 61 50 0.18 15 -- 3 39 61 50 0.18 16 -- 4 38 61 49 0.17 16 -- 5 38 60 49 0.17 16 -- 6 38 60 49 0.17 16 -- 7 38 60 49 0.17 17 -- 8 37 59 48 0.17 17 0 9 37 59 48 0.17 17 0 10 37 59 48 0.17 17 0 11 37 59 48 0.17 17 0 12 37 58 48 0.17 18 0 13 37 58 47 0.17 18 0 14 36 58 47 0.17 18 0 15 36 58 47 0.17 18 0 16 36 57 47 0.17 18 0 17 36 57 47 0.17 19 0 18 36 57 46 0.17 19 0 19 36 57 46 0.17 19 0 20 35 57 46 0.17 19 0 21 35 56 46 0.17 19 0 22 35 56 46 0.17 20 0 23 35 56 46 0.17 20 0 24 35 56 45 0.17 20 0 25 35 56 45 0.17 20 0 26 35 56 45 0.18 20 0 27 34 55 45 0.18 20 0 28 34 55 45 0.18 20 0 29 34 55 45 0.18 21 0 30 34 55 45 0.18 21 0 31 34 55 45 0.19 21 0 Month 36 58 47 5.37 567 7 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