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December Normals for Black Diamond, WA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 36 48 42 0.21 23 0 2 36 48 42 0.2 23 0 3 36 47 41 0.2 24 0 4 36 47 41 0.2 24 0 5 36 47 41 0.2 24 0 6 35 47 41 0.2 24 0 7 35 47 41 0.2 24 0 8 35 47 41 0.19 24 0 9 35 47 41 0.19 24 0 10 35 46 41 0.19 24 0 11 35 46 40 0.19 25 0 12 35 46 40 0.19 25 0 13 35 46 40 0.19 25 0 14 35 46 40 0.19 25 0 15 35 46 40 0.19 25 0 16 35 46 40 0.19 25 0 17 35 46 40 0.18 25 0 18 34 46 40 0.18 25 0 19 34 46 40 0.18 25 0 20 34 46 40 0.18 25 0 21 34 46 40 0.18 25 0 22 34 45 40 0.18 25 0 23 34 45 40 0.18 25 0 24 34 45 40 0.18 25 0 25 34 45 40 0.18 25 0 26 34 45 40 0.18 25 0 27 34 45 40 0.18 25 0 28 34 45 40 0.18 25 0 29 34 45 40 0.18 25 0 30 34 46 40 0.18 25 0 31 34 46 40 0.17 25 0 Month 35 46 40 5.81 763 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