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September Normals for Boone, CO

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 54 85 70 0.05 1 6 2 54 85 69 0.05 1 6 3 54 85 69 0.05 1 5 4 53 84 69 0.04 1 5 5 53 84 69 0.04 1 5 6 52 84 68 0.04 1 5 7 52 83 68 0.04 1 4 8 52 83 68 0.03 1 4 9 51 83 67 0.03 2 4 10 51 83 67 0.03 2 4 11 51 82 66 0.03 2 4 12 50 82 66 0.03 2 3 13 50 82 66 0.03 2 3 14 49 81 65 0.03 2 3 15 49 81 65 0.02 3 3 16 49 81 65 0.02 3 3 17 48 80 64 0.02 3 3 18 48 80 64 0.02 3 2 19 47 80 64 0.02 3 2 20 47 79 63 0.02 4 2 21 47 79 63 0.02 4 2 22 46 79 63 0.02 4 2 23 46 79 62 0.02 4 2 24 45 78 62 0.02 4 2 25 45 78 61 0.02 5 2 26 44 78 61 0.02 5 1 27 44 77 61 0.02 5 1 28 44 77 60 0.02 6 1 29 43 76 60 0.02 6 1 30 43 76 59 0.02 6 1 Month 49 81 65 0.84 88 91 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