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December Normals for Lake Oswego, OR

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 37 48 42 0.22 23 0 2 37 47 42 0.21 23 0 3 37 47 42 0.21 23 0 4 37 47 42 0.21 23 0 5 37 47 42 0.21 23 0 6 36 47 42 0.21 24 0 7 36 47 42 0.21 24 0 8 36 46 41 0.21 24 0 9 36 46 41 0.21 24 0 10 36 46 41 0.21 24 0 11 36 46 41 0.21 24 0 12 36 46 41 0.21 24 0 13 36 46 41 0.21 24 0 14 36 46 41 0.21 24 0 15 35 45 40 0.2 25 0 16 35 45 40 0.2 25 0 17 35 45 40 0.2 25 0 18 35 45 40 0.2 25 0 19 35 45 40 0.2 25 0 20 35 45 40 0.2 25 0 21 35 45 40 0.2 25 0 22 35 45 40 0.2 25 0 23 35 45 40 0.2 25 0 24 35 45 40 0.2 25 0 25 35 45 40 0.2 25 0 26 35 45 40 0.2 25 0 27 35 45 40 0.2 25 0 28 35 45 40 0.2 25 0 29 35 45 40 0.2 25 0 30 35 45 40 0.19 25 0 31 35 45 40 0.19 25 0 Month 36 46 41 6.33 756 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