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December Normals for Napa, CA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 39 60 49 0.17 16 0 2 38 60 49 0.17 16 0 3 38 60 49 0.16 16 0 4 38 60 49 0.16 16 0 5 38 60 49 0.16 16 0 6 38 60 49 0.16 17 0 7 37 59 48 0.16 17 0 8 37 59 48 0.16 17 0 9 37 59 48 0.16 17 0 10 37 59 48 0.16 17 0 11 37 59 48 0.16 17 0 12 37 59 48 0.16 17 0 13 37 59 48 0.16 18 0 14 37 58 47 0.16 18 0 15 36 58 47 0.16 18 0 16 36 58 47 0.16 18 0 17 36 58 47 0.16 18 0 18 36 58 47 0.16 18 0 19 36 58 47 0.16 18 0 20 36 58 47 0.17 18 0 21 36 58 47 0.17 18 0 22 36 58 47 0.17 18 0 23 36 58 47 0.17 18 0 24 36 57 47 0.17 18 0 25 36 57 47 0.18 18 0 26 36 57 47 0.18 18 0 27 36 57 47 0.18 18 0 28 36 57 47 0.19 18 0 29 36 57 47 0.19 18 0 30 36 57 47 0.19 18 0 31 37 57 47 0.2 18 0 Month 37 58 48 5.22 541 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