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December Normals for Seatac, WA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 38 48 43 0.2 22 0 2 37 48 43 0.2 22 0 3 37 48 42 0.2 23 0 4 37 48 42 0.2 23 0 5 37 47 42 0.2 23 0 6 37 47 42 0.2 23 0 7 37 47 42 0.2 23 0 8 37 47 42 0.2 23 0 9 36 47 42 0.2 23 0 10 36 47 41 0.2 24 0 11 36 47 41 0.2 24 0 12 36 47 41 0.2 24 0 13 36 46 41 0.2 24 0 14 36 46 41 0.2 24 0 15 36 46 41 0.2 24 0 16 36 46 41 0.2 24 0 17 36 46 41 0.2 24 0 18 36 46 41 0.2 24 0 19 36 46 41 0.19 24 0 20 36 46 41 0.19 24 0 21 36 46 41 0.19 24 0 22 36 46 41 0.19 24 0 23 36 46 41 0.19 24 0 24 35 46 41 0.19 24 0 25 35 46 41 0.19 24 0 26 35 46 40 0.19 25 0 27 35 46 40 0.19 25 0 28 35 46 41 0.19 24 0 29 35 46 41 0.19 24 0 30 36 46 41 0.19 24 0 31 36 46 41 0.18 24 0 Month 36 47 41 6.06 735 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