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December Normals for Grand Isle, LA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 49 68 58 0.14 8 1 2 48 68 58 0.14 8 1 3 48 68 58 0.14 8 1 4 48 67 58 0.13 9 1 5 47 67 57 0.13 9 1 6 47 67 57 0.13 9 1 7 47 67 57 0.13 9 1 8 47 66 57 0.12 9 1 9 46 66 56 0.12 9 1 10 46 66 56 0.12 10 1 11 46 66 56 0.12 10 1 12 46 66 56 0.12 10 1 13 46 66 56 0.12 10 1 14 45 65 55 0.12 10 1 15 45 65 55 0.12 10 1 16 45 65 55 0.12 10 1 17 45 65 55 0.12 11 1 18 45 65 55 0.12 11 1 19 44 65 55 0.12 11 1 20 44 64 54 0.12 11 1 21 44 64 54 0.13 11 0 22 44 64 54 0.13 11 0 23 44 64 54 0.13 11 0 24 44 64 54 0.13 12 0 25 44 64 54 0.13 12 0 26 44 64 54 0.14 12 0 27 44 64 54 0.14 12 0 28 43 64 53 0.14 12 0 29 43 64 53 0.15 12 0 30 43 63 53 0.15 12 -- 31 43 63 53 0.16 13 -- Month 45 65 55 4.03 322 22 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