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December Normals for Roy, MT

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 13 37 25 0.02 40 0 2 12 36 24 0.02 41 0 3 12 36 24 0.02 41 0 4 12 36 24 0.02 41 0 5 11 36 24 0.02 41 0 6 11 36 23 0.02 42 0 7 11 35 23 0.02 42 0 8 11 35 23 0.02 42 0 9 10 35 23 0.02 42 0 10 10 35 22 0.02 43 0 11 10 34 22 0.02 43 0 12 9 34 22 0.02 43 0 13 9 34 22 0.02 43 0 14 9 34 21 0.02 44 0 15 9 34 21 0.02 44 0 16 8 33 21 0.02 44 0 17 8 33 21 0.02 44 0 18 8 33 21 0.02 44 0 19 8 33 20 0.02 45 0 20 8 33 20 0.02 45 0 21 7 32 20 0.02 45 0 22 7 32 20 0.03 45 0 23 7 32 19 0.03 46 0 24 7 32 19 0.03 46 0 25 7 31 19 0.03 46 0 26 6 31 19 0.03 46 0 27 6 31 19 0.03 46 0 28 6 31 19 0.03 47 0 29 6 31 18 0.03 47 0 30 6 30 18 0.03 47 0 31 6 30 18 0.03 47 0 Month 9 33 21 0.72 1362 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