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December Normals for Castro Valley, CA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 45 58 52 0.12 13 0 2 45 58 52 0.12 13 0 3 45 58 52 0.11 13 0 4 45 58 51 0.11 14 0 5 45 58 51 0.11 14 0 6 45 58 51 0.11 14 0 7 44 57 51 0.11 14 0 8 44 57 51 0.11 14 0 9 44 57 51 0.11 14 0 10 44 57 51 0.11 14 0 11 44 57 51 0.11 15 0 12 44 57 50 0.11 15 0 13 44 57 50 0.11 15 0 14 44 56 50 0.11 15 0 15 44 56 50 0.11 15 0 16 44 56 50 0.11 15 0 17 43 56 50 0.11 15 0 18 43 56 50 0.11 15 0 19 43 56 50 0.11 15 0 20 43 56 50 0.11 15 0 21 43 56 50 0.11 15 0 22 43 56 50 0.11 15 0 23 43 56 50 0.11 15 0 24 43 56 49 0.12 16 0 25 43 56 49 0.12 16 0 26 43 56 49 0.12 16 0 27 43 56 49 0.12 16 0 28 43 56 49 0.12 16 0 29 43 56 49 0.13 16 0 30 43 56 49 0.13 16 0 31 43 56 49 0.13 16 0 Month 44 57 50 3.54 460 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