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December Normals for Riley, OR

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 18 39 28 0.04 37 0 2 18 38 28 0.04 37 0 3 17 38 28 0.04 37 0 4 17 38 27 0.04 38 0 5 17 38 27 0.03 38 0 6 17 37 27 0.03 38 0 7 16 37 27 0.03 38 0 8 16 37 26 0.03 39 0 9 16 37 26 0.03 39 0 10 16 37 26 0.03 39 0 11 15 36 26 0.03 39 0 12 15 36 26 0.03 39 0 13 15 36 26 0.03 39 0 14 15 36 25 0.03 40 0 15 15 36 25 0.03 40 0 16 14 36 25 0.03 40 0 17 14 35 25 0.03 40 0 18 14 35 25 0.03 40 0 19 14 35 25 0.03 40 0 20 14 35 25 0.03 40 0 21 14 35 24 0.03 41 0 22 14 35 24 0.03 41 0 23 14 35 24 0.02 41 0 24 13 35 24 0.02 41 0 25 13 35 24 0.02 41 0 26 13 35 24 0.02 41 0 27 13 35 24 0.02 41 0 28 13 35 24 0.02 41 0 29 13 35 24 0.02 41 0 30 13 35 24 0.02 41 0 31 13 34 24 0.02 41 0 Month 15 36 25 0.88 1228 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