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December Normals for Rock Island, WA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 23 38 31 0.08 34 0 2 23 38 30 0.08 35 0 3 23 38 30 0.08 35 0 4 22 37 30 0.08 35 0 5 22 37 30 0.08 35 0 6 22 37 29 0.08 36 0 7 22 36 29 0.08 36 0 8 21 36 29 0.08 36 0 9 21 36 29 0.08 37 0 10 21 36 28 0.08 37 0 11 21 35 28 0.08 37 0 12 20 35 28 0.08 37 0 13 20 35 28 0.07 37 0 14 20 35 27 0.07 38 0 15 20 35 27 0.07 38 0 16 20 34 27 0.07 38 0 17 19 34 27 0.07 38 0 18 19 34 27 0.07 38 0 19 19 34 27 0.07 39 0 20 19 34 26 0.07 39 0 21 19 34 26 0.07 39 0 22 19 34 26 0.07 39 0 23 18 33 26 0.07 39 0 24 18 33 26 0.07 39 0 25 18 33 26 0.07 39 0 26 18 33 26 0.07 39 0 27 18 33 26 0.07 39 0 28 18 33 25 0.07 40 0 29 18 33 25 0.07 40 0 30 18 33 25 0.07 40 0 31 18 33 25 0.07 40 0 Month 20 35 27 2.29 1168 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