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December Normals for Saint Marys, IA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 20 39 29 0.06 36 0 2 20 38 29 0.05 36 0 3 19 38 28 0.05 37 0 4 19 37 28 0.05 37 0 5 18 37 28 0.05 37 0 6 18 36 27 0.05 38 0 7 18 36 27 0.04 38 0 8 17 36 26 0.04 39 0 9 17 35 26 0.04 39 0 10 16 35 26 0.04 39 0 11 16 34 25 0.04 40 0 12 16 34 25 0.04 40 0 13 15 34 25 0.04 40 0 14 15 33 24 0.04 41 0 15 15 33 24 0.03 41 0 16 14 33 24 0.03 41 0 17 14 32 23 0.03 42 0 18 14 32 23 0.03 42 0 19 14 32 23 0.03 42 0 20 13 32 23 0.03 43 0 21 13 31 22 0.03 43 0 22 13 31 22 0.03 43 0 23 12 31 22 0.03 43 0 24 12 31 21 0.03 44 0 25 12 30 21 0.03 44 0 26 12 30 21 0.03 44 0 27 11 30 21 0.03 44 0 28 11 30 21 0.03 45 0 29 11 30 20 0.03 45 0 30 11 30 20 0.03 45 0 31 10 29 20 0.03 45 0 Month 15 33 24 1.14 1273 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