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September Normals for Lewistown, MT

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 47 75 61 0.06 7 3 2 47 75 61 0.06 7 3 3 46 74 60 0.06 7 2 4 46 74 60 0.06 7 2 5 46 73 59 0.06 8 2 6 45 73 59 0.05 8 2 7 45 72 59 0.05 8 2 8 44 72 58 0.05 9 2 9 44 71 58 0.05 9 2 10 44 71 57 0.05 9 1 11 43 71 57 0.05 9 1 12 43 70 57 0.05 10 1 13 43 70 56 0.05 10 1 14 42 69 56 0.05 10 1 15 42 69 56 0.05 10 1 16 42 68 55 0.05 11 1 17 41 68 55 0.05 11 1 18 41 68 54 0.05 11 1 19 41 67 54 0.05 11 1 20 41 67 54 0.05 12 0 21 40 67 54 0.05 12 0 22 40 66 53 0.04 12 0 23 40 66 53 0.04 12 0 24 39 66 53 0.04 13 0 25 39 65 52 0.04 13 0 26 39 65 52 0.04 13 0 27 39 65 52 0.04 13 0 28 38 65 51 0.04 14 0 29 38 64 51 0.04 14 0 30 38 64 51 0.04 14 0 Month 42 69 56 1.46 314 30 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